small design improvements
correctly reset drop overlay after drop
new hash algorithm & punbb

- correctly log into punbb after login
- even if password is upgraded
obsolete symfony plugin
cookies & prefs

- not use to delete a cookie if we set him later in restorePrefs
- symfony did not properly exited, so cookies where delted / added once more!
- broke the language filter
helper needed in mobile version
mobile forums
make fold.js less specific towards elevation profile
section folding

try to remove some onclick handlers
cleaning