Description of a single row of the 2-bit BHT
add testbench for single row of BHT
Add demultiplexer
add TB for demux
Insert the BHT-based BPU into the fetch_stage.

Didn't try, but it probably won't compile yet... needs a few fixes
connect PC value to BPU input
BHT and new fetch_stage compile :D on with the tests...
BHT_onerow works! update TB for better demonstration
demux_generic also works! include tb result.
FIX bpu_bht.vhd
Update BPU testbench
Add filtering of no_check_d and set_wrong_force_d in case a flush is being done.
Merge branch 'master' into HEAD

Conflicts:
	vhdlsim/fetch_stage/fetch_stage.vhd