LI-FLIM: add modulo support for phase and frequency data

Phases are added to ModuloT; frequencies are added to ModuloZ.  This is
consistent with how phases/frequencies are handled in other formats.

Fixes #12290.
Tidy up a few lingering series population issuse

The series count is now at most 2, so extra bookkeeping to divide
primary images from background images is not necessary.
ScanR: fix exposure time units

See http://www.openmicroscopy.org/community/viewtopic.php?f=13&t=7554
merge dev_5_0 -D org: PR 1196 (Close IFormatReader copy if not to be used)
merge dev_5_0 -D org: PR 1197 (Add modulo support for LI-FLIM data (rebased onto dev_5_0))
merge dev_5_0 -D org: PR 1198 (ScanR: fix exposure time units (rebased onto dev_5_0))
merge dev_5_0 -D org

Repository: openmicroscopy/bioformats
Already up-to-date.

Merged PRs:
  # PR 1196 joshmoore 'Close IFormatReader copy if not to be used'
  # PR 1197 melissalinkert 'Add modulo support for LI-FLIM data (rebased onto dev_5_0)'
  # PR 1198 melissalinkert 'ScanR: fix exposure time units (rebased onto dev_5_0)'
Generated by OMERO-5.0-merge-push#88 (http://ci.openmicroscopy.org/job/OMERO-5.0-merge-push/88/)