raster layer properties and mask patches

[Jonathan Coles]

this weekends activities have resulted in the following changes:

o The LayerProperties class is a base class for layer 
  property dialog boxes to inherit from. Some basic information
  that all layers have is put at the top of the box, and then
  subclasses are allowed to add to it.

  This was needed for at least two reasons: 1) The Classifier
  class was trying to support Layer and RasterLayer, which
  led to bugs 2) Adding other kinds of property boxes for
  new layers is now easier and more consistent.

o The RasterLayerProperties dialog box displays information
  specific to raster layers and allows the user to set which
  color (or index in the case of greyscale or palette-based
  images) should be used as a mask. This information is used
  by gdal when projecting the image. gdalwarp.cpp had to 
  modified to accomodate the mask being specified in thuban.

o The mask color and whether or not the mask should be used
  are saved in the .thuban file.

o New tests to cover the changes to the model.

i've attached all the patches. there may seem to be a lot, but they
really only cover the above two items.

--jonathan

-- 
=====================================================================
 Jonathan Coles                               http://www.jpcoles.com
 jonathan at jpcoles.com                    GnuPG Key: /gpg_pub_key.asc
=====================================================================
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