Some more librfid hacking

Today I fixed a number of long-standing bugs in librfid, resulting mainly from the conversion to autoconf/automake. Now, finally, users can actually use the native CCID driver again, rather than using OpenCT.

Also updated the README, added a udev rules file and started to make the librfid-tool program (formerly OpenCT-escape) a bit more flexible and user-accessible. It's my sincere hope that some other users (i.e. from the CCC) will write the missing user interface stuff and fix some remaining bugs...