This patchfile patches from v. 2.2 to v. 2.1.

They can be cleanly applied by going into the main ZCODE Patch directory
(the one with Makefile, zcdiff.c, etc.) and running the following commands:

cp history/2_2-to-2_1/zcode-patch-2_2-to-2_1.patch .
patch -p1 < zcode-patch-2_2-to-2_1.patch 
rm zcode-patch-2_2-to-2_1.patch 

You will then have the v. 2.1 source files.

(Note that this patch file is not precisely the one included in v. 2.2,
 which had a slight mistake, which has here been corrected.)