flake8 fixes to core files
Update robotframwork readme file.
Merge remote-tracking branch 'origin/dev_5_0' into flake8-fixes-core

Conflicts:
	components/tools/OmeroPy/test/integration/library.py
Added pythonpath to omero admin diagnostics.
Fix a couple of errors and use markdown since this is an md document.
Standardise the report paths.
A few minor fixes.
Merge pull request #2285 from kennethgillen/pythonpath_to_diagnostics

Added pythonpath to omero admin diagnostics.
Merge pull request #2278 from ximenesuk/flake8-fixes-core

Integration tests - flake8 fixes to core files
Merge pull request #2279 from ximenesuk/robot-readme

Update robotframework readme file.