Revert "ZipHandle: make length computation more efficient"

This reverts commit b10dea4476f17e8e98ffb1fc412a779e84660d03.

The seekToEntry and length population can not be consolidated, as
apparently the entry size field is not guaranteed to be populated. Thus
the method of reading until empty seems to be correct.
Revert "ZipHandle: remove unnecessary entryCount logic"

This reverts commite eadf957c6930347468ca72c832cd550e5dff718.

Marked the method deprecated instead of removing it outright.
Fixed ImageMetadata population

When populating ImageMetadata using an OMEXMLMetadata, was accidentally
counting size Z as both Z and T axis lengths. Fixed.
Changed default calibration values

ImgOpener should now populate default calibration values of 1.0 instead
of NaN, to allow computations that assume calibration values to be
performed.
WIP: ImgSaver

Updated signatures to prevent infinite loop/NPE

Also force translation to SCIFIO Metadata, to trigger format-specific
translation processees.