Add catman, makewhatis functionality.  Print an error if the whatis database
is missing.

*** 50,59 ****
--- 50,60 ----
                  builtin.1                       \
                  cal.1                           \
                  calendar.1                      \
                  cancel.1                        \
                  cat.1                           \
+                 catman.1                        \
                  cd.1                            \
                  cdrw.1                          \
                  checknr.1                       \
                  chgrp.1                         \
                  chkey.1                         \