[Simh] Beta 4 script feature/bug with set throttle n%

[Terry Newton]

Hello,

The new simh supports substitution using %, a nice feature
however it breaks scripts that use: set throttle [some number]%
A workaround is to use \% as in: set throttle 50\%
But would be better to ignore % unless a parameter is actually supplied,
then existing startup scripts (almost all of mine) don't have to be modified.

So, in scp.c I changed...

        if (*ip == '%') {                               /* sub? */

...to...

        if ((*ip == '%') && (ip[1] != ' ') && (ip[1] != '\0')) { /* sub? */

...and set throttle 50% works correctly now, also fixes display commands
like 'echo Throttle is set to 50% now'. At least provided there's not a non-space
character after the %, otherwise substitution is triggered.

Terry Newton