Revising testing page to document pytest. See #11423
Add further help on using setup.py
Fix a few minor errors from PR review.
Minor changes following review.
Removed git cruft.
Merge pull request #528 from ximenesuk/testing-pytest-update-dev

Document pytest on developer testing page
Update homebrew git link
Merge pull request #534 from hflynn/mxcl_homebrew_link

Update homebrew git link
Ticket #11649 fix & tidying
Fixes from Blazej
Clarify the use of the -k option and py.test.
Fixing broken source link
Merge pull request #538 from hflynn/rebased/develop/11649

Adding JVM memory settings to main install docs (rebased onto develop)
Merge pull request #539 from ximenesuk/clarify-pytest

Clarify pytest options