Remove sphinx.environment.BuildEnvironment and sphinx.util.relative_uri

This feature does not work for now
Fix docstrings of omero.callbacks
Fix omero __init__.py header
Fix docstrings in omero.gateway

Should remove all warnings when building the sphinx-api
Fix docstring of omero.install.versions
Fix docstring in omero.util.import_candidates
Fix docstring in omero.util.populate_roi
Fix docstring in omero.util
OmeroCpp: Add portability fixes for gtest

Some combinations of gtest and the C++ standard library result in
compile failure due to the objects being tested not having
stream output operators.  Change these assertions to avoid
stream output.
Merge pull request #2900 from rleigh-dundee/cpp-gtest-fixes-dev50

OmeroCpp: Add portability fixes for gtest
Merge pull request #2899 from sbesson/sphinxapi_compilation

Fix warnings in Sphinx API generation
Update dev_5_0 submodules

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

Repository: ome/scripts
Already up-to-date.

Repository: openmicroscopy/ome-documentation
Updating 8a94f48..a34b993
Merged PRs (fast-forward):
  # PR 918 sbesson 'Update auto-generated properties'
  # PR 921 ximenesuk ' DropBox configuration clarification'
  # PR 917 ximenesuk 'Import documentation tweaks'

Generated by OMERO-5.0-latest-submods#466 (http://ci.openmicroscopy.org/job/OMERO-5.0-latest-submods/466/)