Don't set bottom and top color in heatmap colors.

git-svn-id: https://svn.code.sf.net/p/genoviz/code/trunk@15150 80d5a9c2-7d8c-4c9f-9369-4e03bca4d2bd
Fixing the edge cases.

git-svn-id: https://svn.code.sf.net/p/genoviz/code/trunk@15151 80d5a9c2-7d8c-4c9f-9369-4e03bca4d2bd
Get top and bottom color.

git-svn-id: https://svn.code.sf.net/p/genoviz/code/trunk@15152 80d5a9c2-7d8c-4c9f-9369-4e03bca4d2bd
Fixing getting color for heatmap.

git-svn-id: https://svn.code.sf.net/p/genoviz/code/trunk@15153 80d5a9c2-7d8c-4c9f-9369-4e03bca4d2bd
Adding delete menu item.

git-svn-id: https://svn.code.sf.net/p/genoviz/code/trunk@15154 80d5a9c2-7d8c-4c9f-9369-4e03bca4d2bd
Merge remote-tracking branch 'upstream'