Merge pull request #986 from sbesson/omero_session_dir

Document usage of new OMERO_SESSION_DIR envvar for the CLI
Revisions based on initial review.
merge develop -Dorg -Ijburel/openmicroscopy:qa-submit-new -Ssuccess-only: PR 973 (Team workflow doc)
merge develop -Dorg -Ijburel/openmicroscopy:qa-submit-new -Ssuccess-only: PR 988 (Property index)
merge develop -Dorg -Ijburel/openmicroscopy:qa-submit-new -Ssuccess-only: PR 989 (Add paragraph about the store recycling while retrieving pixel data)
merge develop -Dorg -Ijburel/openmicroscopy:qa-submit-new -Ssuccess-only: PR 990 (for users who have compiled isapi_wsgi on x64)
merge develop -Dorg -Ijburel/openmicroscopy:qa-submit-new -Ssuccess-only: PR 991 (updating documentation to use new glosary)
merge develop -Dorg -Ijburel/openmicroscopy:qa-submit-new -Ssuccess-only: PR 992 (Add disk usage sections to cli pages.)
merge develop -Dorg -Ijburel/openmicroscopy:qa-submit-new -Ssuccess-only

Repository: openmicroscopy/ome-documentation
Updating 9f72455..9dbefc4
Previously merged:
  # PR 986 sbesson 'Document usage of new OMERO_SESSION_DIR envvar for the CLI'

Merged PRs:
  # PR 973 hflynn 'Team workflow doc'
  # PR 988 sbesson 'Property index'
  # PR 989 sbesson 'Add paragraph about the store recycling while retrieving pixel data'
  # PR 990 kennethgillen 'for users who have compiled isapi_wsgi on x64'
  # PR 991 aleksandra-tarkowska 'updating documentation to use new glosary'
  # PR 992 ximenesuk 'Add disk usage sections to cli pages.'

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