WinHugs, run mode bug fix

[Neil Mitchell]

Hi,

BUG:
If you load a file that fails, i.e. because of a syntax error, then
the program remains in run mode with the Run button disabled and the
Stop button enabled.

This patch fixes this bug. Instead of relying on executing after
doCommand, it traps the message pump which is restarted after longjmp.

Thanks

Neil
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