Merge branch 'proposed-master' of git://ohwr.org/level-conversion/conv-common-gw into proposed-master

Merge branch 'DB-rs485-integration' of ohwr.org:level-conversion/conv-common-gw into DB-rs485-integration

correcting for a push omission, and realigning remote and local
branches

File contained instructions to modify wbgen2 generated vhdl. This is no longer required as explained in the file

Modified top files to use more generic front names rather than signal types that are more specific to a particular board, Eg: ttl and blo for conv-ttl-blo. Now using front and rear instead. this can now be reused with conv-ttl-rs485

Modified wbgen script to remove any references to ttl or blo signal types. Sole reference to front or rear signals

Some ports have been renamed. Notable some of the sfp ports, and a start on trying to replace all signal references, ttl or blo, with reference to input type, front or rear.

Small bug fixes to new version of conv_pulse_gen.vhd. Bug in pulse counters in top file conv_common_gw fixed. pulse counters were not resetting after the external loading of new values.

Major changes: conv_pulse_gen.vhd has been almost completely rewritten. Also top file now uses pulse periods instead of duty cycles, this is to be able to cope with none round duty cycles

Modified pulse counting process to use a Flancter based counter which is able to count very fast pulses

Cleaned up code with very small modifications to reflect new memory map with hardware revision number