Since getEnabledApps() depends on an authentication app to be loaded,
especially in the case of LDAP, the cache from getEnabledApps() is now
cleared to make sure that subsequent calls will properly return apps
that were enabled for groups.
This is because getEnabledApps() uses the inGroups() function from the
group manager provided by LDAP or any other authentication app.

Revert "[WIP] fix retrieval of group members and cache group members"

fix retrieval of group members and cache group members

check if I can create a file at the location

Added description in line with other apps.

Added updates description

Made app description paralell in structure to other app descriptions

Added larger app description

Added new app description
Removed links to CE documentation

Updated the description of the app for the app panel.

Config sample cleanup

* owncloud -> ownCloud
* add default value
* proper comment style
* fix line wrapping and minor typo
* remove duplication
* add Vincents proposals

* use ' instead of " for config option
* place default parameters where useful into sample
* use proper comment block
* limit line size to 80 characters

Fix file size comparator return value

fixes #10501

Conflicts:
	apps/files_external/lib/amazons3.php

folder size and mtime is always unknown in s3

more s3 fixes

make rescanDelay of root dir configurable, add on the fly update of legacy storage ids, !isset -> empty when checking strings

reduce number of http calls on remove and rmdir

fix typo

[encryption] some visual improvements

implement case-insensitive search for groups in sharing dialog

increase whitespace below headings in settings

This reverts commit 0df070a8.

fix for issue #10483

reduce bottom padding in filelist, fix perceived glitching, fix #11213