fix schema migration hooks (partial) SQL Server requires some additional steps to alter columns (index drop and restore, etc...) and this in turn requires passing a connection on the DB to find out the indexes. Also partially fix an issue where the null_allowed value was not correctly computed. Still some problems in there (see https://www.logilab.net/cwo/ticket/1109558)

delete trailing whitespace

Had thought this could be done in cube, but it really needs to be done earlier in the migration process

EntityFormRenderer redefine open_form and add a div section, so redefine close_form to add the closing div tag

Backed out changeset c29c90223125 which breaks the cw tests

EntityFormRenderer redefine open_form and add a div section, so redefine close_form to add the closing div tag

reduce log verbosity in ldapuser source

[session] refactor session handling so that when calling session.close(), pool of long running transaction of the same session is properly freed

[debug views] set http cache max age to 0 on debug views

cleanup

[schema view] width isn't in authorized th attribute in xhtml DTD. katia, please do it another way.

[schema view] fix typo

[rql2sql] #1089207: do not encode Unicode strings from RQL statements to db encoding

fix bad merge

[css] more css rework, need visual test in compat/new modes

backport stable