- adjustments to match new ast/parser interface
- removed printer.go; functionality now in astprinter.go and docprinter.go
  (more cleanups pending)
- enabled new doc printing in gds
  (lots of fine tuning missing, but pieces falling into place; e.g. methods
  associated with types. Consts, Vars, to come. Collection of all files
  belonging to a package to come)

R=r
OCL=26970
CL=26972