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/LBoundComboBox.cpp

@@ -163,17 +163,17 @@ void LBoundComboBox::Clear()
     SetWindowStyleFlag(wsflags);
 }
 
-bool LBoundComboBox::SetData(const wxAny& data)
+void LBoundComboBox::SetData(const wxAny& data)
 {
     const wxString sData = data.As<wxString>();
     if (IsTranslated())
     {
         if (data.IsNull()
-            || sData.IsEmpty()
-            || sData == L_SQLNULL)
+                || sData.IsEmpty()
+                || sData == L_SQLNULL)
         {
             SetNull();
-            return (GetSelection() != wxNOT_FOUND); // ?
+            return;
         }
         for (unsigned int i = 0; i < GetCount(); i++)
         {
@@ -183,18 +183,16 @@ bool LBoundComboBox::SetData(const wxAny& data)
                 if (x->GetData().As<wxString>() == sData)
                 {
                     SetSelection(i);
-                    return true;
+                    return;
                 }
             }
         }
     }
     else
     {
-        bool hasData = FindString(sData, true);
+        //bool hasData = FindString(sData, true);
         SetValue(sData);
-        return hasData;
     }
-    return false;
 }
 
 const wxAny LBoundComboBox::GetData()
@@ -245,7 +243,7 @@ bool LBoundComboBox::IsNull()
     }
 }
 
-bool LBoundComboBox::SetNull()
+void LBoundComboBox::SetNull()
 {
     if (IsTranslated())
     {
@@ -255,17 +253,16 @@ bool LBoundComboBox::SetNull()
             if (x == NULL)
             {
                 SetSelection(i);
-                return true;
+                return;
             }
         }
-        return false;
+        return;
     }
     long wsflags = GetWindowStyleFlag();
     SetWindowStyleFlag(0);
     SetSelection(wxNOT_FOUND);
     SetValue(wxEmptyString);
     SetWindowStyleFlag(wsflags);
-    return true;
 }
 
 bool LBoundComboBox::IsDirty()