Gatan: adjust physical pixel sizes based upon the "Units" field

Fixes ticket #11509.
Flex: prevent NPE when filter data is missing

Fixes #11286.
Volocity: remove stacks that do not contain valid files

Fixes #11265.
Cellomics: fix handling of channels and analysis images

Channels are now detected correctly.  If the original file passed to
setId is a "d" channel (i.e. original image), then only "d" channels
will be included in the used file list.  If the file passed to setId is
an "o" channel (i.e. analysis results), then only "o" channels will be
included in the used file list.

Fixes #11148.
Zeiss CZI: fix Z size calculation

For linescans in particular, the Z size is stored in the 'size' field,
not the 'start' attribute.

Fixes ticket #11513.
FileStitcher: prevent readers from remaining open

This allows datasets with thousands of files to be opened without
causing the JVM to run out of file handles.

Fixes ticket #10971.
Cellomics: correct field index for single file datasets
test-suite: pass the testng.configSuffix argument to TestNG

Conflicts:

	components/test-suite/build.xml
test-suite: allow configuration file suffix to be configurable

The default configuration file name is ".bioformats".  Setting the
testng.configSuffix property (e.g. to "stable") means that the preferred
configuration file is changed to (".bioformats." + testng.configSuffix), e.g.
".bioformats.stable".  If ".bioformats.stable" is not found, then
".bioformats" is still used.

This means that we can now do this in dev_4_4 Jenkins jobs:

ant -Dtestng.directory=/path/to/repo/ -Dtestng.configSuffix=stable test-automated

and then any dev_4_4-specific config files will be picked up.  That way,
changes on either branch that affect configuration can be made without
causing the other set of jobs to fail.
Cellomics: remove redundant check for the channel character
Flex: do not link to objectives that do not exist
Adding BF 5 to Fiji update docs
Changing name to 'Bio-Formats 5' update site
Merge pull request #777 from melissalinkert/minor-import-fixes

Various minor import fixes
Merge pull request #782 from melissalinkert/config-file-suffix-develop

Make configuration file suffix configurable (rebased onto develop)
Merge pull request #784 from hflynn/fiji-dev-update

Adding BF 5 to Fiji update docs