document new // separator in omero.fs.repo.path

reflects changes arising from fixing
http://trac.openmicroscopy.org.uk/ome/ticket/12160
adjust for permitting no root-owned directories
merge develop -D org: PR 743 (Propose redesign of OMERO and Bio-Formats 5.0 CI jobs)
merge develop -D org: PR 782 (Custom web login 11961 (rebased onto develop))
merge develop -D org: PR 783 (document new // separator in omero.fs.repo.path (rebased from dev_5_0))
merge develop -D org

Repository: openmicroscopy/ome-documentation
Already up-to-date.

Merged PRs:
  # PR 743 sbesson 'Propose redesign of OMERO and Bio-Formats 5.0 CI jobs'
  # PR 782 will-moore 'Custom web login 11961 (rebased onto develop)'
  # PR 783 mtbc 'document new // separator in omero.fs.repo.path (rebased from dev_5_0)'

Generated by OMERO-5.1-merge-push#222 (http://ci.openmicroscopy.org/job/OMERO-5.1-merge-push/222/)