DOC Include some more dependencies
Fix parsing (x,y) byte deltas in stf file.

Within a stroke, each coordinate can be encoded using an absolute position, an 8-bit delta, or a prefix-free coded delta. Fix the 8-bit deltas, which are actually signed integers.
Update the makefile generator

We now use pkg-config more often, and specify the version of wx-config.
Use systemwide libusb
Use the new functions defiend in openobex 1.7