wrc.ram: Updated to last version with Etherbone support. Copy ep_pfilter with etherbone to extra folder.
doc: Updated project doc

	- Updated WR-NIC architecture diagram (dia file uploaded too)
	- Changes in doc/wr-nic.md to update information
		- Channel 0 output is dedicated for 1-PPS signal
		- P mode removed from DIO configuration registers
		- Added new section about remote configuration with Etherbone
		- Initial channel configuration is changed
		- Updated LM32 firmware generation