Fix 1465

remove the check for session data folder - causes trouble on some enviro...

Fixes apps require version checking

version checks for apps now use all three version numbers and fixed bug that would not do the version check correctly for the second version

don't use the number of written bytes as indicator if streamCopy() was successful

let's try to find another solution for =C6

Set required owncloud version to 4.93

add a safe_mode check

Don't throw insufficient storage exception if free space is unknown

Whitespace cleanup

Fetch displayname in userlist ajax requests. Refs #1681

Add OC\Files\Filesystem::isFileBlacklisted

return both, count and result if the operation succeeded or failed. Maybe in some cases it is useful to know how much bytes where copied

Codestyle cleanup

using the number of writen bytes as indicator if streamCopy() was successfully. Instead check if fwrite returns the number of bytes or false

Fix order of mount commands in lib/files/filesystem.php

mount users home before write/read file to it, necessary to deal with external homes [master]

keep transparency when resizing or cropping png/gif

Fix error path in changedisplayname call