Remove some dead code.
Pure Go MTP library, based on cgo libusb.

Basics work; todo:

* Files over 4G
* Rename
* Android extensions
Generic decoding of dependent types; add support for large file sizes.
Loop over all object properties in test.
Implement SetObjectPropValue and rename.
Read just a single packet in fetchPacket.
Fix up consts that do not fit in 32 bits by hand.
Implement android extensions.
Better debugging.
Make timeout tunable. Remove debug print.
Use android extensions, and drop all manipulation of files under /tmp.
Make error print prettier
Drop obsolete libmtp patch.
update README.
Move FS to fs/ subdir, add basic test.