Fixed a NPE when a mask is null in BitmapImage.java
Add support for properly encoding binary data as a hexadecimal string object (including encryption).
Adjust palette generation for indexed bitmaps to work correctly with encryption.
git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/branches/Temp_ImagePackageRedesign@611133 13f79535-47bb-0310-9956-ffa450edef68