Log Message:
Changes 1.00:
added Canon tags, minor tweaks
fixed handling of short ASCII strings
added Panasonic tags
enhanced Nikon maker note support for newer cameras
internal code cleanup to allow separate maker TIFF info
added new Canon shooting modes
fixed exiftime crash on missing tags
fixed looping from recursive Canon IFD ref
sanitize ASCII tags to handle corrupt maker notes
added Panasonic values, tags
image number support for Canon EOS-20D
added Canon EOS-20D custom function support
added Sigma maker note support
added Canon tag values, calculate EV's
fixed flash tag processing to catch all possible values
fixed spelling for Minolta values