Added a data sheet viewer. It improves upon the design used in gta02-core by

allowing a hierarchy of caches, by using only one directory for each cache,
and by putting only one command in the PATH.

- scripts/dsv: new and improved data sheet viewer (successor of gta02-core's
  dsv)
- Makefile: added "dsv" target to update the bookshelf
- ds/INFO, components/INFO, modules/INFO: ds/INFO moved to BOOKSHELF
- components/INFO, modules/INFO: renamed "D" tag to "N", for consistency with
  BOOKSHELF
- BOOKSHELF: changed "stdpass" URL to the actual PDF

Makefile

@@ -1,18 +1,21 @@
-.PHONY:		all gen generate sch brd xpdf
+.PHONY:		all gen generate sch brd xpdf dsv
 
 all:
-		@echo "make what ? target: gen sch xpdf brd"
+		@echo "make what ? target: gen sch brd xpdf dsv"
 		@exit 1
 
 gen generate:
 		eeschema --plot `pwd`/wpan-atrf.sch
 		# need scripts
 
-xpdf:
-		xpdf wpan-atrf.pdf
-
 sch:
 		eeschema `pwd`/wpan-atrf.sch
 
 brd:
 		pcbnew `pwd`/wpan-atrf.brd
+
+xpdf:
+		xpdf wpan-atrf.pdf
+
+dsv:
+		scripts/dsv setup BOOKSHELF