recent changes

[Russell Nelson]

Jonathan Coles writes:
 > here's a summary of the changes i just checked in:
 > 
 > 	o Assume that a mask should always be applied to a layer
 > 	  unless the user explicitly turns it off. The flag is
 > 	  *not* saved, however.

I don't see much of a speed difference, but I have a reasonable fast
machine.  Might be more visible on slower machines.

 > 	o Instead of returning the mask as RGB triples, it suffices
 > 	  to create a bit array that can be used to create a bitmap
 > 	  using wxBitmapFromBits(). This reduces the amount of 
 > 	  memory and also eliminates the need to first convert the
 > 	  mask to a wxImage and then to a wxBitmap.

Hmmm...  The mask isn't always getting set correctly using
http://russnelson.com/potsdam-railroads.tar.gz .  But sometimes it
is.  If you move it around, sometimes it gets drawn correctly.

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