Tentative Use of a Built-In DTD
- workaround of the problem of always locate a DTD on the file system
Fix Issue #14 :
- Add a function vtkDefaultIsAddin in ExcelUtilities
- Set the isAddIn property of the Workbook when recreating a configuration
Cleant obvious clutter in confprod code.

- removed InitializeConfigurationForActiveWorkbook in vtkCM
- removed function vtkActivateReferences in vtkProjectCreationUtilities
- removed tmp block in XMLExportTester
Merge branch 'master' into xmlConfiguration

Conflicts:
	Project/VBAToolKit.xml
	Project/VBAToolKit_DEV.xlsm
	Source/ConfProd/vtkImportExportUtilities.bas
	Source/ConfTest/vtkRecreateConfigurationTester.cls
	Source/ConfTest/vtkXMLExportTester.cls
	Source/VbaUnit/TestClassLister.cls
Commit post-merge.
Prep run working.
Removed external DTDs.

A lot of files modified, but small modifications, and always the same.

- Removed functions that create external DTDs
- Removed all the calls to theses functions from Tester classes
- Added built-in DTDs in functions that create blank XML sheets
- Removed the files in Templates
- Added built-in DTDs in XML files present in templates

Prep running.