testXHTML: update default place of w3c validator
testXHTML: reuse code ERP5TypeTestCase to locate business template

Since commit 3ff662ddf6024abc7359dbc1aae6c2e146317f0e ("fix bt search path
for testXHTML"), BT were not searched anymore in $INSTANCE_HOME/bt5/*/
tests: fix text formatting of results on Python 2.7
Clean up TemplateTool.getDependencyList()
Fix additional_bt5_repository_id into testnode.py
Fix bt5_path into ERP5TypeTestCase.py and ERP5TypeTestSuite.py
erp5.util: release version 0.4.35
ERP5TypeTestCase: Remove shortDescription introduced by mistake

This revert partially commit
"Fix bt5_path into ERP5TypeTestCase.py and ERP5TypeTestSuite.py"
(81f4553af)
ERP5TypeTestCase: fix a coding convention
Fix error message of StringAttributeMatch Constraint incorrectly renamed after migration to ZODB (78e2ae3).

Also, rename message_attribute_does_not_match to message_attribute_not_match
to follow ERP5 naming conventions.
Implement migration of StringAttributeMatch from filesystem to ZODB.
Fix migration of error messages in some Constraints.
Invalid error message returned in CategoryMembershipArity Constraint.
Support new sorting feature which user can specify order of sort explicitly.
Improve listbox sort feature.

Now both ascending arrow and descending arrow are displayed in title column
and user can sort in specific order explicitly. User also can sort multiple
columns by click without using sort-on-dialog.
Fix loading of Portal Type after renaming of SynchronisationTool.
After upgrade, VCS is used instead of SVN in erp5_forge (migration has not been implemented).

If an user has set SVN working copies in its preferences, it cannot be
modified anymore after upgrade.
Allow to specify bt5 which are not going to be upgraded (meaningful for master data for example).
Fix dead ProxyFields.

PasswordTool_viewResetPassword/text_content from erp5_core wrongly requires
Field Library in erp5_web and EmbeddedFile_view/my_description from erp5_base
wrongly requires Field Library in erp5_dms.
Improve error handling on Workflow_statusModify. If requested transition is not available, then show a nice message.