this is a patch that updates both, the streamers code in wr-cores and
the instantation of streamers. a separate commit just in case that this
is not a good idea.

This is to follow naming convetion for single-cycle pulse signal
This change concern all but the wr_streamers stuff that is in wr-cores.
The change of stuff inside wr-cores will be in the following and
separate commit

t was hard to get fully coherent statistics, especially if they were changing
fast (e.g. 250kHz in btrain). Setting snapshot bit to high copies at the same
instant all the counters to separate registers. as long as snapshot bit is high,
these registers are exposed to WB and SNMP. so one can read it as long as it
takes and the data is still coherent.

Conflicts:

	hdl/rtl/WRtransmission/wr_transmission_wb.vhd
	hdl/rtl/WRtransmission/wr_transmission_wbgen2_pkg.vhd

added tx/rx bfield to the SNMP diagnostics

Conflicts:

	hdl/top/BTrainSPEC/BtrainSpecTop.vhd

domain crossing bugfix in wr streamers stats.

This is to allow in the future to retrieve and reset statistics
collected by WR Streamers via SNMP.

in particular:
- moved html files to doc/wb-regs and modified appropriately build scripts
- removed unused wbgen stuff from oldBtrain

it contains streamers as well as a WB-accessible registers for:
- reading/controling statistics (module to be added)
- debugging
- controlling streamers, e.g. reset sequence

created the folder struture as discussed with Maciej && added wr-core spec_top.vhd as a starting point && added needed git submodules && added Olb B hdl code