Wip friedliche

[aurexli]

Added hell_mv:
Instead of mv only one file to a destination file, all files in the destination folder are also mv-ed. Only files with matching extension are mv-ed.
for example:
directory has a.txt b.txt c.txt d.bin e.pdf h.txt
call: mv1 h.txt t.txt

result:
directory now has: t3.txt t4.txt t1.txt d.bin e.pdf t2.txt

Currently works only when the destination and source folders are ./