disabled warning and errinfo message redirect.(issue #9)
cat --hex compatible with old format (issue #11)
bug fixed for write 0x82a4
key 'C' to Single Sector for Buggy BIOS on startup.
(tinybit) fix offset nestification problem for virtual drives built on another in-situ virtual drive.
(tinybit) mask off non-booting floppy drives in order to gain more stability.
Merge pull request #3 from chenall/master

20141103