vita: moved clear register to overlap with nchan register
This fixes the bug where setting the format clears the vita RX.This is only an issue when the noclear option is set by UHD,because the format register is always so, so it always clears.Note: noclear is there to support the backwards compat API (pre streamer)....
fpga: force -include_global for custom sources
ISE will not recognize custom sources as part of the hierarchy,and thus will not compile (unless its the first macro...).
Remove custom sources from the source list,and specially add them with the -include_global option.
usrp2/nseries: added churn to meet timing
Added churn to readback mux on nseries to make n200r4 meet timing.Also added churn to usrp2 for parallelism, but assigned to zero.
dsp rework: implement 64 bit ticks no seconds
dsp rework: pass vita clears into dsp modules, unified fifo clears
dsp rework: rehash of the custom module stuff and readme
dsp rework: custom engine module for rx/tx vita chain
dsp rework: paramaterize post_engine_buffering
dsp rework: added double buffer interface to vita tx
dsp rework: moved scale and round into ddc chain
16to8 engine now performs only a clip from 16->8
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