[GRASS5] [bug #3799] (grass) tcl "Help" buttons

this bug's URL: http://intevation.de/rt/webrt?serial_num=3799
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Subject: tcl "Help" buttons

Can we add a test to see if the .html file exists before launching?
If it is not there we should grey-out the "Help" button on the
parser-generated GUI module windows?
Stops unhelpful "help not found" errors.

eg d.m scripts and the new d.paint.labels symlink.

Hamish

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