add a searchbymime to the public api. Please all remember that access to internal oc classes will be disabled for all app for ownCloud 6. So please port yur stuff to the public api :-)

This reverts commit 3b33712d.

Blacklisted files like ".htaccess" and ".git" should not only be
blacklisted for upload and rename, but they should also not be displayed
in the directory listings.

I needed this personally to hide ".git" folders in shared folders. Its
also a simple implementation of feature requests like
http://forum.owncloud.org/viewtopic.php?f=4&t=3279 and
http://forum.owncloud.org/viewtopic.php?f=3&t=5708

Fixes #2312

Fix OC_Files::get() to not return the first character of the filename
if only one file is requested.

disable MDB2_PORTABILITY_EMPTY_TO_NULL for mssql to allow insert of empty string to no null fields

write error message to log file in case insert to file cache failed - took hours to find that the insert failed :-(

fixing copy operation on mapper

use pre_unshare hook, otherwise the share is already removed. Which means that we have no chance to determine which folder has to be updated