Filesys is a implementation of a filesystem Backend for the Elektra.
Each Key is a file in the filesystem.
It is as secure as filesystem security. It is as reliable as filesystem.
The drawback is that it needs much space on disc, because most filesystems will need at minimum 4kb for each file.
It uses only standards C calls, which makes it usable by very low level or early boot stage software, like /sbin/init.
