ugh...
parsing "df" output is horribly ineffecient and unreliable.
it also does not work most of the cases.
So now we have a fullblown class which wraps statvfs() in an async and extremely difficult to use API.

Absolutely great.

Fixes the "free space" monitor in dolphin. it could have been fixed by calling "df -a" as well, but I love ripping out code. and this rips out lots of crufty misty and sloppy code. Yay!