* added dirty bit tracking for future use * refactored copyInto() to reuse existing copy code
* added dirty bit tracking for future use
* refactored copyInto() to reuse existing copy code

This used to be revision r2919.

biovoxxel/imagej,TehSAUCE/imagej,biovoxxel/imagej,TehSAUCE/imagej,TehSAUCE/imagej,biovoxxel/imagej