- use C99 compiler flags

- use C99 compiler flags
- implement some getopt/setopt functions for UID and layer2 specific parameters
- basic rfid scanning support
- add commandline arguments for layer2 / scanning to librfid-tool
- try to detect both supported readers automatically in librfid-tool
- add new 'l2_supported' and 'proto_supported members to rfid_reader

git-svn-id: https://svn.gnumonks.org/trunk/librfid@1895 e0336214-984f-0b4b-a45f-81c69e1f0ede