merge tag adding and type-checking

Added install instructions

Added extra metadata to setup() call in setup.py

Tweaked header comment in dat2tdv.py

Removed default "UNKNOWN" version identifier

Moved get_version_number function from pycanlib into separate hgversi…

…onutils package

Fixed NameError when creating received CAN message

Added deprecation message to xml2tdv.py

Updated ReadCAN.py and can_logger.py to work with new CAN.py

canlib.py: added constants for acceptance filter types (standard/exte…

…nded messages)

canstat.py: added canNOTIFY_ALL flag (combination of all other canNOTIFY_x flags)