. Minor Makefile cleanups.

. Use ${MAKE_ENV} to invoke make to install the manual pages instead of
  just passing in ${PREFIX}.  This also lets us use ${MANPREFIX} and
  ${BSD_INSTALL_MAN} to do the manual page installation.
. Use %%DATADIR%% and %%DOCSDIR%% in the packing list.
. Don't forcibly remove the save file directory when deinstalling.
. Don't forcibly remove the save file directory when installing.
. Build and install the recover utility.
. Bump PORTREVISION due to adding the recover utility.  Since the forcible
  removing of save files has been disabled this shouldn't cause nethacking
  portupgrade users to reach for Stormbringer, Vorpal Blade or Excalibur
  (which is just as well for them since I have Mjollnir and gauntlets of
   power).  They might even thank me next time they are about to ascend and
  nethack crashes.

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