ratarmount

Fixes

Do not check mount point because of faulty os.path.ismount, simply try fusermount.
Avoid total I/O hang when lazy-mounting a folder with archives onto itself.

Return a valid file info and file version count for /.
Make the original archive viewable as an older file version when using AutoMountLayer.
Resolve symbolic links pointing outside the source folder given to FolderMountSource to not break them.
Do not return a valid FileInfo for invalid paths such as ../...
Make --index-minimum-file-count work for the TAR backend.
The index should not be created for very small archives.
Root file info userdata was not initialized correctly.
Index validation did fail for TAR entries with more than 2 metadata blocks.
Do not check for folder consistency because parent folders get automatically added to the index.
Move _createFileInfo out of MountSource class to fix "protected-access" warning.
Joined files (a.001, a.002) did not work because of an accidentally shared list.
Do not check file header for zip, only for the footer, to detect self-extracting archives.