BioFormatsFormat: fix bug in axis array conversion
BioFormatsFormat: tweak bits per pixel logic
BioFormatsFormat: convert subC dims to real axes

This change promotes Bio-Formats "sub-C" dimensions (accessible via the
getChannelDimTypes and getChannelDimLengths methods) to full-fledged
SCIFIO dimensions. Interleaved sub-C dimensions are prepended; regular
sub-C dimensions are filled in wherever "C" is specified in the
dimension order.
ReadFile: print out dimensional sizes per image