Version 0.70 to v0.71
---------------------
Extension separator changed from '_' to the standard '/'.

Fixed "channel on channel 253" error in shadow modes, caused by incorrectly
calculated return address.

exit() and system() pass return value via osbyte 1.

Seperate installation-specific locals in local/h.

Version 0.71 to v0.72
---------------------
String buffer in printf() library extended to 256 characters, string buffer
in shell extended to 128 characters.


Future intentions
-----------------
Allow CLib-dependant code to be run from outside the shell by finding and
paging in the C Library rom.

Move general string buffer to $0600 to match most other apps' GSBUF.

Structure the system libraries according to a more common convention (ie,
strlib.h, stdlib.h, stdio.h, etc.)

Put as much of the compiler in a rom image as possible.

Possibly allow '_' to be continued to be used.  Possibly also allow
"c.name" convention used in Acorn Desktop C.

Write a C Rom Header Generator, equivalent to the C Module Header
Generator.

Allow compile-time specification of load/exec address instead of default
of $1902.

If at all possible, allow dynamic use of PAGE to HIMEM.