Merge pull request #147 from BNoiZe/master

Migrated customer_extras to new PDO database class, refs #1287
remove unused upgrade procedures, migrated a few minor functions and files to PDO database, fixed FROXLOR_INSTALL_DIR define for master-cronjob, fixes #1294

Signed-off-by: Michael Kaufmann (d00p) <d00p@froxlor.org>
Merge branch 'master' of github.com:Froxlor/Froxlor