Another libtar hardlink workaround
Fix capturing exit status to properly display libtar results

Error conditions were always showing successful in the TWRP GUI
making it much more difficult to determine if a backup or restore
was actually successful.
More file selector fixes

Fix a freeze that occurs when you move or delete a file in the
file manager
Make file sort buttons work again

Change-Id: Ifcb68edf3c29c475946d538748729485d0840842
Merge "Another libtar hardlink workaround" into twrp2.4
Merge "Fix capturing exit status to properly display libtar results" into twrp2.4
use md5.c for computation of md5sums
create a framework for computing digests and reading digests in TWRP
add space for backwards compatibility with bb md5sum
Change-Id: Ia18e3f430eed5eba22e5052d39b9b8d88ecd4536
Merge remote-tracking branch 'twrp/twrp2.4' into twrp