Updating sed

This was also straight-forward to re-compile.  For some reason the original version when installed from the downloaded PCSI wouldn't create Makefiles when ever a script tried to use it.  I spent ages trying to work out what was causing configure. scripts to fail, usually with something along the lines of:

sed %s %s unable to ...

Once I'd recompiled and installed (the same version of) sed, the problem went away.

Recompilation was

$ set def gnv$gnu:[000000]
$ @[build]build.com
directory: sed
$ set def PRJ_ROOT:[sed]
$ @[.vms]pcsi_product_sed.com

I replaced /debu and /debug with /opt=(tune=host) in sed.mms before recompiling.  This leaves me with an optimised version of sed 4.2.2