Tweaks per Hans.
Add check target by default.  Fix packaging.  And make check output match
hdrchk, etc.

*** 30,39 ****
--- 30,40 ----
  
  $(ROOTMAN)/man$(MANSECT)/% $(ROOTHASMAN)/man$(MANSECT)/%: %
                  $(INS.file)
  
  $(MANCHECKS):
+                 @$(ECHO) "checking $(@:%.check=%)"; \
                  $(MANDOC) -Tlint $(@:%.check=%)
  
  $(MANLINKS):
                  $(RM) $@; $(SYMLINK) $(LINKSRC) $@