Adding trac admin links to linkcheck ignore list
Remove repetition of a paragraph.
Add introduction.
Add sections regarding test groups and methods.
Re-word Java and Eclipse sections.
Minor fixes
Merge pull request #568 from sbesson/submodule_dependency_fix

Submodule dependency fix
Fix spelling mistakes.
Tidying, formatting & file order
ticket 11669 fix - OmeroPyGateway process
merge develop -D org -I include -E exclude: PR 533 (Removing BF anchor until it exists)
merge develop -D org -I include -E exclude: PR 557 (remind that model changes may affect IceMapper)
merge develop -D org -I include -E exclude: PR 566 (Document latest OMERO.matlab functions)
merge develop -D org -I include -E exclude: PR 567 (Updating contributing developer guidance)
merge develop -D org -I include -E exclude: PR 569 (Add group and test method execution doc (see #11677))