Signed-off-by: Leonidas Spyropoulos <artafinde@gmail.com>

Mark Weiman authored Nov 09, 2016 and Lukas Fleischer committed Nov 10, 2016

In commit baf8a220

 (git-interface: Support SQLite as database backend,
2016-08-03), conf/config.proto was changed so that dsn_prefix was
changed to backend and this fixes this in web/lib/DB.class.php.

Since SQLite's dsn is different, this adds a check of which backend is
desired and will quit if MySQL or SQLite are not the backend selected.
SQLite2 may be supported, but is untested and will trigger an error if
used.
Signed-off-by: Mark Weiman <mark.weiman@markzz.com>
Signed-off-by: Lukas Fleischer <lfleischer@archlinux.org>

Replace web/lib/config.inc.php with an INI-style configuration file.
This allows us to get rid of several globals and makes it easier to use
the same configuration file in external scripts.
Signed-off-by: Lukas Fleischer <archlinux@cryptocrack.de>

Uses the Singleton pattern to ensure all queries use the same
database connection that is released upon script completion.

All database connections should now be called with DB::connect() and
not db_connect().
Signed-off-by: canyonknight <canyonknight@gmail.com>
Signed-off-by: Lukas Fleischer <archlinux@cryptocrack.de>