EB/UDP/IP Header package

created all record fields, constants and IO routines.

TODO: header length calculation, IP/UDP checksums
not meant to checked in.
marked for obliterate
all EB-Core vhdl goes here
checksum generator working

redesign of etherbone protocol in progress.
goals:
-non blocking
-non dropping
-high throughput
-full implementation of pipelined wishbone interface -wishbone standard compliant
new version with revised Etherbone packet header
bugfix
new record scheme for packet header.

Parallel testing of wishbone stuff, not here
Altera SOPC component declaration
Etherbone C++ API
Packet format
More stuff