Added MPL 2.0 to the licenses package.

In addition, all files in the package have uniform and descriptive names now.
The package search cache is faster to search now.

When a package entry is added to the cache, it gets sorted and duplicate entries
are removed, to speed up search.

In addition, two error message typos in roar-ng were corrected.
Updated LFTP to version 4.4.5.