Docs on BOOTSTRAP relations

Cleaned up the README somewhat. Removed a useless statement which was
even marked as outdated (if someone really wants the old one, have
them dig through CVS).

Also added a note that in order for a BOOTSTRAP table to be created,
it is required to have data in it. You wouldn't believe the number of
other changes I made before that one. Fiddled with OID ranges, order
of the creation among other things.

Also made a note of the order of the header files in the
POSTGRES_BKI_SRCS line.

--
Rod Taylor

Your eyes are weary from staring at the CRT. You feel sleepy. Notice
how restful it is to watch the cursor blink. Close your eyes. The
opinions stated above are yours. You cannot imagine why you ever felt
otherwise.