syn/specdio/wrc.ram: Updated WRPC firmware

Note: In the wrpc-sw repository, a tag has been created for the new release version of wr-nic. This tag is "wrpc-v2.1-for-wrnic".
doc/pandoc.latex: the float package is used by default.

This package is needed to use 'H' option in figures.
doc: Project document improved.

	- wr-nic.md improved
	- Move the dia diagram file to the imgsrc folder
	- Unnecessary files deleted
	- dio_core_pps image improved