Fixed fourth public release

fixed for upload to pypi

Fourth public release

• more documentation
• support FMMUs for ethercat
• support more hardware
• add tests

third public release

• support PacketVar to access variables in packets
• support minimumPacketSize to simplify packet handling
• add documentation

second public release

• Improved loading/unloading of epbf and maps
• support for fixed-point variables
• support driver-mode epbf for XDP