installation: duplicate mechanize removal

* Addresses problem with duplicated requirement for mechanize package.
  (closes #1520)

Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>
Reported-by: Jan Aage Lavik <jan.age.lavik@cern.ch>
SQLAlchemy: fix for MySQL gone exception handling

* Addresses problem with unclear exception when MySQL is down.
  (closes #1518)

Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>
BibFormat: fix for bfe_fultext function

Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>
installation: SQLAlchemy version 0.8.2

* NOTE: Updates version of SQLAlchemy. Please run
  `pip install SQLAlchemy==0.8.2 --upgrade`.

Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>
WebSession: fix for settings data saving

* Addresses issue with Boolean field in settings forms.

* Saves form data instead of POST data from request.

Signed-off-by: Krzysztof Lis <krzysztof.lis@cern.ch>
Co-authored-by: Jiri Kuncar <jiri.kuncar@cern.ch>
WebSubmit: fix for fileupload interface

Reported-by: Arthur Alejandro Oviedo Urazmetov <arthur.oviedo@cern.ch>
Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>
BibFormat: template ctx function prefix changed

* Renames template context function prfix from bfn_ to tfn_

Signed-off-by: Esteban J. G. Gabancho <esteban.gabancho@cern.ch>
Reviewed-by: Jiri Kuncar <jiri.kuncar@cern.ch>