Check for the posix extension

don't show no files yet when mask is in place, fixes #13141

Check for the posix extension - refs https://github.com/owncloud/core/pull/13282#issuecomment-69602645

Fixes issues when renaming favorite file

This fixes an issue when renaming files from a flat list view like
"Favorites" or "Shared with you", in which case the path needs to be
present in the response to make sure the data-path attribute is properly
set in the JS side.

To make it possible for the web UI to correctly display the tag/favorite
information after a rename, this information is now returned in the
rename response

Check array size, before using the 3rd element from it

Check for current user to have the same id then the owner of the config ...

Send the proper original name for uploaded files

fix retrieval of user groups

Check for existence of $_GET keys

Allow dropping files on the table container

Make it possible to drop files below the table even if the table is
smaller than the window height.

Added a check to make sure upload is not triggered on invisible lists.

make versions of shared files downloadable

make Share/Download buttons localized again

l10n: delete permanently fix

version up

it seems we have forgotten to use named FileAction

keep spaces out of translation

32-bit typo fix

otherwise translators cannot notice it on Transifex

Don't double encode string

Simplify isValidPath and add unit tests

Verify whether value is already normalized

Use isset() instead of strlen()

Cache results of `normalizePath`

Add CSRF check to search

Apparently `normalizer_normalize` is not verifying itself whether the string needs to be converted or not. Or does it at least not very performantly.

This simple change leads to a 4% performance gain on the processing of normalizeUnicode. Since this method is called quite often (i.e. for every file path) this has actually a measurable impact. For examples searches are now 200ms faster on my machine. Still not perfect but way to go.

Part of https://github.com/owncloud/core/issues/13221