[GRASS5] New help button - please text review

[Hamish]

> > > > Do you need the final dash (-) in the GRASS_PAGER variable?
> > > > In other words:
> > > > setenv GRASS_PAGER "xmessage -center -file"
..
> > > Magic! This works
..
> > ... ah yes. The "-file -" indicates input is to be piped from stdin.
> > 
> > xmessage works, but is very inconsistent with the rest of the GRASS
> > GUI.
> 
> Meanwhile I disovered that
> 
> - Hamish's version works for g.list
> - John's version works for g.setproj
> 
> GRASS_PAGER doesn't behave the same...


One takes input piped from stdin, the other from a filename. (?)

xmessage can't figure this out automatically and needs to be told which
one it is getting.

I don't know how to get a shell script to do both. "read" strips
whitespace from between words, how else to read from stdin?

Again I'd push for a g.message C module which takes input from stdin or
a file and makes a Tcl display window ala a module started with no
options.


Hamish