I got sick and tired of having to keep track of NIDs when such a thing

I got sick and tired of having to keep track of NIDs when such a thing
could be done automagically, much like the numbering in libeay.num and
ssleay.num.  The solution works as follows:

  - New object identifiers are inserted in objects.txt, following the
    syntax given in objects.README.
  - objects.pl is used to process obj_mac.num and create a new
    obj_mac.h.
  - obj_dat.pl is used to create a new obj_dat.h, using the data in
    obj_mac.h.

This is currently kind of a hack, and the perl code in objects.pl
isn't very elegant, but it works as I intended.  The simplest way to
check that it worked correctly is to look in obj_dat.h and check the
array nid_objs and make sure the objects haven't moved around (this is
important!).  Additions are OK, as well as consistent name changes.