truecrypt deprecated, refs #134

truecrypt is moved to a new package, which contains the binary, too.
It is wrapped with a zenity dialog

This does NOT close the bug completely
move art to freepto-graphics. refs #139

It does NOT fix the abovementioned bug
add freepto-usb-utils as submodule

remove makefreepto (provided by freepto-usb-utils)
upgrade freepto-usb-utils
FIX stop overriding makepersistence