Insert OMERO sidebar template after page TOC sidebar

OME-DCO-1.1-Signed-off-by: Sebastien Besson <seb.besson@gmail.com> (github: sbesson)
Merge pull request #827 from aleksandra-tarkowska/nginx_doc

Nginx doc
Reformatting VA docs to make less intimidating!
Re-working OMERO sysadmin index page
updating screenshot
De-emphasize omero.web.application_server in unix docs

Move omero.web.application_server lower down
(Note is this relevant to IIS?)

Add paragraph explaining fastcgi-tcp vs fastcgi

Conflicts:
	omero/sysadmins/unix/install-web.txt
Merge pull request #845 from manics/rebased/develop/clarify_fastcgi

Clarify fastcgi (rebased onto develop)
Merge pull request #843 from aleksandra-tarkowska/IIS_compatibility_mode

adding HTTP response header
merge develop -D org: PR 799 (Linux walkthrough (rebased onto develop))
merge develop -D org: PR 824 (OME DCO)
merge develop -D org: PR 834 (Session engine)
merge develop -D org: PR 846 (Insert OMERO sidebar template after page TOC sidebar (rebased onto develop))
merge develop -D org: PR 849 (Reformatting VA docs to make them less scary  (rebased onto develop))
merge develop -D org: PR 850 (Re-working OMERO sysadmin index page (rebased onto develop))
merge develop -D org

Repository: openmicroscopy/ome-documentation
Updating 191511b..8dc46c7
Merged PRs (fast-forward):
  # PR 843 aleksandra-tarkowska 'adding HTTP response header'
  # PR 845 manics 'Clarify fastcgi (rebased onto develop)'
  # PR 827 aleksandra-tarkowska 'Nginx doc'

Merged PRs:
  # PR 799 manics 'Linux walkthrough (rebased onto develop)'
  # PR 824 sbesson 'OME DCO'
  # PR 834 aleksandra-tarkowska 'Session engine'
  # PR 846 hflynn 'Insert OMERO sidebar template after page TOC sidebar (rebased onto develop)'
  # PR 849 hflynn 'Reformatting VA docs to make them less scary  (rebased onto develop)'
  # PR 850 hflynn 'Re-working OMERO sysadmin index page (rebased onto develop)'
Generated by OMERO-5.1-merge-push#317 (http://ci.openmicroscopy.org/job/OMERO-5.1-merge-push/317/)