#110 Forbid deletion of the "Plain" Text Drawing Style

[Tony Balinski]

Without this patch, you can easily delete all occurrences
of the "Plain" style. This breaks things. The patch allows
you to have more than one "Plain" style (as before), but
will not allow you to delete them all: one at least must
remain.

[Tony Balinski]

[Eddy De Greef]

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I consider this a bug fix, so I'd commit it right away, but
I have two remarks:
- Why did you remove the comment in macro.c? I see nothing
wrong with it.
- You renamed the "top" pattern to "", so why not remove
the special case for "top" in macro.c too?

[Tony Balinski]

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Committing this is probably a good idea.
The patch is quite old, and I have kept it up to date by
regenerating it from time to time.
Re - the comment: that's a mistake, I can't remember why I
removed it.
Re - access to "top" in macro.c: that is also a mistake,
introduced no doubt by my patch updating! I did actually
remove the "top" stuff in fillPatternResult(), leaving only the
"else" limb of the test in which it occurs. If you do the check-
in, I think you could make this change too.

[Eddy De Greef]

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It's in CVS (with the additional changes). Thanks.