UserInterfacePanel: no null check boxes

Ensures that _analysisCheckBoxList is never null. This avoids NPEs when loading slim curve.
ExcitationFileUtility: don't reinvent bytesToDbl

The implementation of a custom bytesToDouble is unnecessary given that
we have DataTools that can do the same conversion, without unnecessarily
restricting ourselves to 32/64 bit data.
ExcitationFileUtility: enable channel separator

Ensure that we can't get back interleaved data.
SLIMProcessor: read lifetime physical size

Updated SLIMProcessor to use SCIFIOImgPlus so that the metadata can be
accessed directly. This allows us to investigate the physical size of
the lifetime axis, which can then be used directly as the time range,
which can be more accurate in some cases.
Bump to pom-loci 1.17

Updates to the latest pom-loci and implicitly pom-scijava.

Includes the latest SCIFIO, with a number of fixes that will be useful
to SLIMCurve.
Merge pull request #38 from hinerm/slim-fixes

Fix time scale + excitation prompt loading