Update MakeTestOmeTiff to handle modulo8D
MakeTestOmeTiff to write Modulo XMLAnnotation
Updating FLIM sample to use ModuloAlongT
Adding back second channel to sample
Add a more complete downgrade sample file
Reverse order xml is built for Abstract types
Adding comments to Genshi end markers
Restrict xml build reversal to Annotations

I think this order should probably be reversed for a wider range of
elements but a general reversal causes problems with the
AbstractProprietary elements. Restricted to just Annotation to
get the code working. Only Annotations have abstract types with
elements, so only they need this fix at the moment.
Merge pull request #602 from qidane/modulotype

Sample Generation and FLIM Sample