Database: Nested transaction crashes

As most of RDBMS do not support nested transactions, only the outermost transaction should be available.

Test: `add` request omits `quiet` option

Upgrade: some parameters in list config files may be removed

Adding "Steps to reproduce" section.

Upgrade: During upgrade from Sympa prior to 6.2b.1, some parameters in list config files may be removed.

Improve xgettext.pl

More fixes for #1286

Show list names when purging closed lists

🙈 — Update .gitignore

Compilation creates some new files that we need to ignore

Stylesheet: Fixing minor bugs in css.tt2

Improvements on anonymized messages

Suppress non-fatal warnings in the tests

  - Raleway might not be used in body but only in headlines.
  - Rendering of monospace font is messy, and it's always bold.
  - Additionally, <code> etc. didn't inherit color and widght.

  Fax, Mailer, Originating-Client, Phone, Telefax, User-Agent,
  X-Face, X-Mailer, X-MimeOLE, X-Newsreader.