OME-TIFF: return blank planes if the corresponding file does not exist

Fixes #12447.
Zeiss CZI: fix dimension calculations when expected planes are missing

See #12556.
Fix testng JAR for Bio-Formats tools components
Zeiss CZI: make sure pixel buffer is cleared

This prevents blank planes from containing garbage data.
OME-TIFF: do not return blank planes for single files with incorrect UUID filenames
Define top-level testng.version property
Deprecate testng.jar
Adding symbol for inch
Fleshing out the Length unit
Adding Time and Length helpers
Fixing helpers for java 1.7
removing createQuantity methods
Removing stray createQuantity
Fixing template unit handler for primitive numbers
Length: wavelength - transmittance
XMLMockObjects: Fix usage of Length.
FormatTools: PositiveInteger becomes Length.

Conflicts:
	components/formats-api/src/loci/formats/FormatTools.java
Fix readers using PositiveInteger.
Length: wavelength - light sources
Fix unit test.