Add back the realpath() checks that got lost during the change from

db to sqlite; they are needed to prevent corruption of the database
when paths containing dot, dotdot, or symlinks are given on the
command line.  Also make sure the exit-code is really non-zero on
system errors and use mandoc(1) exit codes.

To make all this simpler,
 * Drop the "basedir" argument from almost every function and make it
   global because it is really state info used all over the place.
 * Move "startdir" and "fd" as local vars into set_basedir() because they
   are only used for this one purpose, i.e. to move out of basedir again.

While here,
 * Clarify the name of path_arg in the main program; in the -C case,
   it is not a dir, and anyway there are lots of different dirs around.
 * Include missing <stdio.h> needed for perror().

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