[web] get rid of spurious '[Errno 2] No such file or directory' on load This was caused by can_do_pdf_conversion() which tries to use '/usr/bin/fop'. When fop was not available, an OSError was raised by suprocess.Popen. This changeset first checks for /usr/bin/fop presence, then tries to run fop. If an error occurs, log it instead of printing it. NOTE for later: why do we test explicitly for "/usr/bin/fop" rather than simply "fop" ?

backport stable

[schema sync] fix another potential name error on synchronizing rdefs

[schema sync] don't try to synchronize infered relation defs, fixing a name error on the way

cleanup

don't update constraints when it's not necessary

[repo] don't call server_shutdown hooks when creating/repairing instance to be consistence with server_startup hooks

[migration] new build_descr argument to rqlexec on the migration helper

fix migration when upgrading from cw < 3.6 to cw 3.7

disable security when undoing

merge

[sql] fix FSPATH implementation plpy.execute() returns a list of dictionaries with column names as keys and corresponding values as values.