Okay, I've put the new GF conventions into MF, GFtoDV, and GFtype.
I'm counting on the rest of you to do the rest! Soon there will be
a multitude of GF files in the world, so let's stamp out the old
ones before it's too late.

What has changed? Only this:
	There's a new command boc1 c[1] dm[1] max_m[1] dn[1] max_n[1]
which is 19 bytes shorter than the ordinary boc command; people can use
boc1 when p=-1 and the other parameters are between 0 and 255 inclusive.
Parameters dm=max_m-min_m and dn=max_n-min_n make it possible to use
boc1 even when min_m and/or min_n are negative.
	Commands eoc, skip0..3, and new_row_0..164 have their opcodes
increased by 1. (This makes room for boc1 just after boc.)
	Command new_row_165 disappears.
	Command char_loc0 now has its dx parameter shortened to one byte;
the one-byte dx value is multiplied by 65536 to obtain a ``scaled'' number.
	And the ID byte is 131 instead of 130.

Exact details appear on page 48 of MF.WEB[mf,dek].