files_tree commint to github
1rst publish of files_tree on Github
double quotes to simple quote
double quotes to single quote
Backwards compatibility fix: don't accidentially declare OC5's p() functions twice.
Updated a few in code documentations.
Only create handles for panels that are actually present.
Only create handles when applicable, so in normal and settings mode, not in login or guest mode.
Display imprint content horizontally centralized.
Update contacts.css
Remove the clear button and put a clear link in the playlist

As @jancborchardt asked in #869, the clear playlist link shows only if
the playlist is not empty.
Merge pull request #917 from agamann/master

Proposed fix for #602
Contacts: Use auto instead of scroll for the share fix from @agamann
Merge pull request #921 from arkascha/master

Some minor fixes to imprint and fluxx_compensator
Contacts: Don't return true on DAV::put Fix #920
fix accessclass bug in export
only send event's id when deleting it - fixes #922
Pictures: don't use thumbnail maps for album thumbnails

instead only load a single thumbnail image for albums as first and replace them on mouse hover
decreases the amount of data needed to be loaded and fixes the stuttering on scrolling if a lot of albums are on the screen
Pictures: use a queue for loading thumbnails to improve responsiveness while loading thumbnails
Merge pull request #918 from ldidry/media_clear_playlist

Remove the clear button and put a clear link in the playlist