Fixed creating screenshot.

git-svn-id: https://www.imagemagick.org/subversion/ImageMagick/trunk@16700 aa41f4f7-0bf4-0310-aa73-e5a19afd5a74
Added extra parameter to SystemCommand for storing the output from an executed command and implemented this in NTSystemCommand.
Improved reporting errors in SystemCommand for applications that don't have a console.
The PDF and PS readers now print the output from the SystemCommand if no images are loaded.

git-svn-id: https://www.imagemagick.org/subversion/ImageMagick/trunk@16701 aa41f4f7-0bf4-0310-aa73-e5a19afd5a74
Fixed commments.

git-svn-id: https://www.imagemagick.org/subversion/ImageMagick/trunk@16702 aa41f4f7-0bf4-0310-aa73-e5a19afd5a74
Fixed compiler warning.

git-svn-id: https://www.imagemagick.org/subversion/ImageMagick/trunk@16703 aa41f4f7-0bf4-0310-aa73-e5a19afd5a74
Build fix.

git-svn-id: https://www.imagemagick.org/subversion/ImageMagick/trunk@16704 aa41f4f7-0bf4-0310-aa73-e5a19afd5a74
Added missing comment and newlines fix.

git-svn-id: https://www.imagemagick.org/subversion/ImageMagick/trunk@16705 aa41f4f7-0bf4-0310-aa73-e5a19afd5a74
Fixed IsBoundsCleared and CompareImagesBounds.

git-svn-id: https://www.imagemagick.org/subversion/ImageMagick/trunk@16707 aa41f4f7-0bf4-0310-aa73-e5a19afd5a74
Added xyYColorspace

git-svn-id: https://www.imagemagick.org/subversion/ImageMagick/trunk@16709 aa41f4f7-0bf4-0310-aa73-e5a19afd5a74
Added AssociateAlphaChannel, DiscreteAlphaChannel and DisassociateAlphaChannel.

git-svn-id: https://www.imagemagick.org/subversion/ImageMagick/trunk@16711 aa41f4f7-0bf4-0310-aa73-e5a19afd5a74
Added kuwaharaChannel to Magick++.

git-svn-id: https://www.imagemagick.org/subversion/ImageMagick/trunk@16714 aa41f4f7-0bf4-0310-aa73-e5a19afd5a74
git-svn-id: https://www.imagemagick.org/subversion/ImageMagick/trunk@16715 aa41f4f7-0bf4-0310-aa73-e5a19afd5a74