Also improve notification for initial bank reconciliation and remove a field that should never have been used

(cherry picked from commit 3e2c0eb8)

(cherry picked from commit d3bc4c7d)

(cherry picked from commit 86af2076)

(cherry picked from commit c0366b78)

Conflicts:
	bt5/erp5_accounting/bt/revision

Conflicts:
	bt5/erp5_credential/bt/revision

* Method is activated with max_retry 0 and no retry on conflict error
* Document is not modified in case of multiple recipients

also simplify some error messages

This is mostly to avoid problems with proxy fields not finding their template field in default skin selection

Signed-off-by: Aurélien Calonne <aurel@nexedi.com>

getModificationDate: sometimes _p_serial cannot be used for DateTime ( TimeError: The time -2208988800.000000 is beyond the range of this Python implementation. )

When running multiple parralel ingestion updating documents inplace,
manage_delObjects complains that object is already removed (which is not the
case)

Note that after applying this change it's important to clear preferred timezone
for system preferences, as they have priority over user preferences

LongRequestLogger from zope svn which should support mutiple thread according to Leonardo + hack to log mysql query