Merge pull request #2881 from will-moore/searchById_results

Search by id results
Merge pull request #2890 from jburel/date-format-search

Date format search
Add 2008ServerR2 to the supported list.
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
Update error string.
Test Web connection using wget
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 dev_5_0 -D org: PR 2775 (Permissions Test Matlab : Whole Suite)
merge dev_5_0 -D org: PR 2785 (Initial Dockerfile for OMERO)
merge dev_5_0 -D org: PR 2816 (Homebrew nginx)
merge dev_5_0 -D org: PR 2857 (Try search repeatedly and report results)
merge dev_5_0 -D org: PR 2878 (Insight freeze)
merge dev_5_0 -D org: PR 2897 (Add 2008ServerR2 support to DropBox)