tigefa4u projects Trac

Makefile: summary now copes with missing messages-js.po catalog.

TracGuide: updated from t.e.o's content, as of today.

TracMercurial for 0.12: version 0.12.0.22, compatible with 0.12rc1 (use 0.12.0.21 at r9657 with 0.12b1)

query: Fixed generation of radio buttons in !JavaScript on the custom query page.

Patch by jomae. Closes #9395.

(Also small indentation fix in the commit ticket updater.)

Move `with_transaction` and `get_read_db` from `trac.db.util` to `trac.db.api`.

env: unify `get_db_cnx` with `get_read_db`.

As ''transaction-safe'' usage of db connection require the use of `with_transaction`, the legacy `get_db_cnx` which was used to indifferently get connections for reading or for writing should not be used anymore. However, as we continue to support it for 0.12.x, it can nevertheless be made aware of the new mechanism by doing the same thing as `get_read_db`:
- when used for reading, it can therefore benefit from the immediate reuse of the thread-local Connection used for the transaction in progress, if there is one
- when used for writing, what happens is not worse than before, the "explicit" transaction management (i.e. the `commit` pairing the `get_db_cnx`) may terminate a transaction sooner than wanted, in the case this was a nested transaction

l10n/hu: minor proofing

trac.version: allow bootstrap during initial setup, as we now need to be able to import some trac packages (`trac.util.dist`) from setup.py.

Closes #9374.

l10n/es_AR: translations updated (93%)

l10n/he: added messages-js catalog for javascript Hebrew messages. (100%)