Added classes to manage simple tabular data of known structure using a

popup containing a wxGrid object.

BasePicker : Abstract class adding a popup to wxPickerBase  styled with
a wxTextCtrl.
BaseGridPicker : Abstract class adding a wxGrid in the popup.

JsonGridPickerCtrl : UI control storing the tabular data in a JSON
array.
LBoundJsonGridPicker : connect JsonGridPicker to database.
LGridJsonCellEditor : use LBoundJsonGridPicker in other wxGrid objects.
LGridJsonCellRenderer : render cell JSON data.

XmlGridPickerCtrl : UI control storing the tabular data in as XML
document.
LBoundXmlGridPicker : connect XmlGridPicker to database.
LGridXmlCellEditor : grid editor for LBoundXmlGridPicker.
LGridXmlCellRenderer : grid renderer for LBoundXmlGridPicker.

JsonHelper and XmlHelper : for applications to quickly get intent value
from database data..

The structure of managed tabular data :

Column 1 : Intent - this is what we want to store/edit. This can be
telephone numbers, email addresses, instant messaging addresses...
any single line piece of information that can exist many times for one
entity (person, company...).
Column 2 : Type - A short description of the intent : 'Home, Work,
Mobile, Fax, Other...'. It is displayed in a non editable wxComboBox.
Column 3 : Preferred - One line of data can be selected as the preferred
one. It is not mandatory, but it must be a single choice.
Column 4 : Notes - single line notes.

Adjust sql scripts and L7.dox.
Applied ANSI formatting style to all files.

Other changes :

Work around a nasty misbehavior.
Grid columns edited by a translated combobox expect full string
data as cell values. LResultSet::BEData() will report these mapped strings,
instead of database real data. LBoundComboBox::IsDirty() will always be
true even if the editor is unchanged once created.
Simplest workaround : disconnect m_BoundComboBox if unchanged.

LGridTextEditor::ProvideFormEditor() : set the form editor's value
explicitely.; wxTextCtrl does not interpret data it receives

LBoundControl::SetNull must be void.

LBoundGrid : Unbind:: instructions should limit to the widget's id, like Bind::

LConnection::GetReturnedKeys should return NULL.
LConnection::SetData should return void.

Notes : wxJSON must be configured with the same prefix as wxWidgets,
here /usr/local/{wxWidgets,wxWidgets-Release}.

L7/LBoundDatePickerCtrl.cpp

@@ -10,8 +10,8 @@
 #include "LBoundDatePickerCtrl.h"
 #include <wx/tokenzr.h>
 
-LBoundDatePickerCtrl::LBoundDatePickerCtrl(wxWindow* parent, wxWindowID id) 
-        : wxDatePickerCtrl(parent, id, wxInvalidDateTime, wxDefaultPosition, wxDefaultSize, wxDP_DEFAULT|wxDP_ALLOWNONE|wxDP_SHOWCENTURY)
+LBoundDatePickerCtrl::LBoundDatePickerCtrl(wxWindow* parent, wxWindowID id)
+: wxDatePickerCtrl(parent, id, wxInvalidDateTime, wxDefaultPosition, wxDefaultSize, wxDP_DEFAULT | wxDP_ALLOWNONE | wxDP_SHOWCENTURY)
 {
     m_sqlQuote = _T("'");
     SetValue(wxInvalidDateTime);
@@ -22,59 +22,70 @@ LBoundDatePickerCtrl::~LBoundDatePickerCtrl()
     if (m_rs) m_rs->UnRegisterControl(this);
 }
 
-const wxAny LBoundDatePickerCtrl::GetData() {
+const wxAny LBoundDatePickerCtrl::GetData()
+{
     if (IsNull()) return L_SQLNULL;
     return GetValue().GetDateOnly().FormatISODate();
 }
 
-bool LBoundDatePickerCtrl::SetData(const wxAny& newData) {
-    if (newData.IsNull()) {
+void LBoundDatePickerCtrl::SetData(const wxAny& newData)
+{
+    if (newData.IsNull())
+    {
         SetValue(wxInvalidDateTime);
-        return false;
+        return;
     }
-    if (newData.As<wxString>() == L_SQLNULL || newData.As<wxString>().IsEmpty()) {
+    if (newData.As<wxString>() == L_SQLNULL || newData.As<wxString>().IsEmpty())
+    {
         SetValue(wxInvalidDateTime);
-        return true;
+        return;
     }
-    wxString s; newData.GetAs(&s);
+    wxString s;
+    newData.GetAs(&s);
     const wxDateTime dt = BuildDate(s);
-    if (!dt.IsValid()) {
-        SetValue(wxInvalidDateTime);
-        return false;
-    }
     SetValue(dt);
-    return true;
 }
+
 void LBoundDatePickerCtrl::SetResultSet(LResultSet* newResultSet)
 {
     m_rs = newResultSet;
     if (m_rs == NULL) return;
     m_rs->RegisterControl(this);
 }
-bool LBoundDatePickerCtrl::IsNull() {
+
+bool LBoundDatePickerCtrl::IsNull()
+{
     return !(GetValue().IsValid());
 }
-bool LBoundDatePickerCtrl::SetNull() {
-    return SetData(L_SQLNULL);
+
+void LBoundDatePickerCtrl::SetNull()
+{
+    SetData(L_SQLNULL);
 }
-bool LBoundDatePickerCtrl::IsDirty() {
+
+bool LBoundDatePickerCtrl::IsDirty()
+{
     wxASSERT_MSG(m_rs != NULL, "m_rs est NULL.");
     wxAny BEData = m_rs->GetData(m_columnName);
     if (BEData.As<wxString>().IsEmpty()) BEData = L_SQLNULL;
     return (GetData().As<wxString>() != BEData.As<wxString>());
 }
-const wxString LBoundDatePickerCtrl::GetDisplayedData() {
+
+const wxString LBoundDatePickerCtrl::GetDisplayedData()
+{
     if (IsNull()) return wxEmptyString;
     return GetValue().GetDateOnly().FormatDate();
 }
-wxDateTime LBoundDatePickerCtrl::BuildDate(const wxString& ISODate) {
+
+wxDateTime LBoundDatePickerCtrl::BuildDate(const wxString& ISODate)
+{
     wxDateTime dt = wxDateTime::Today();
     if (!dt.ParseISODate(ISODate)) return wxInvalidDateTime;
     unsigned int * res = new unsigned int[3];
     unsigned int i = 0;
     wxAny token;
     wxStringTokenizer tkz(ISODate, _T("-"));
-    while ( tkz.HasMoreTokens() )
+    while (tkz.HasMoreTokens())
     {
         token = tkz.GetNextToken();
         token.GetAs(&res[i]);