Fix whitespace
Rework warning boxes

The number of warning boxes was becoming somewhat
overwhelming. Before adding another one, I restructured
the intro to allow an entire "prep checklist".
Add search re-indexing item
Alphabetize checklist
Add win-config section
simplify wording for search re-index
merge develop -D org: PR 626 (Add new Squash tutorial and screenshots)
merge develop -D org: PR 724 (In-place documentation (rebased onto develop))
merge develop -D org: PR 727 (updating omeroweb console output (rebased onto develop))
merge develop -D org: PR 728 (5.0.1 upgrade additions. (rebased onto develop))
merge develop -D org

Repository: openmicroscopy/ome-documentation
Updating fd4b617..2e7a27c
Merged PRs (fast-forward):
  # PR 720 aleksandra-tarkowska 'Session engine update (rebased onto develop)'
  # PR 725 hflynn 'Remove webstart limitation (rebased onto develop)'
  # PR 723 hflynn 'Updating Demo server availability for 5.0.x (rebased onto develop)'
  # PR 718 rleigh-dundee 'Install cleanup (develop)'
  # PR 714 manics 'Update supported Linux versions for 5.0 (rebased onto develop)'

Merged PRs:
  # PR 626 pwalczysko 'Add new Squash tutorial and screenshots'
  # PR 724 joshmoore 'In-place documentation (rebased onto develop)'
  # PR 727 aleksandra-tarkowska 'updating omeroweb console output (rebased onto develop)'
  # PR 728 joshmoore '5.0.1 upgrade additions. (rebased onto develop)'
Conflicting PRs (not included):
  # PR 726 aleksandra-tarkowska 'Setting cache (rebased onto develop)'

Generated by OMERO-5.1-merge-push#145 (http://ci.openmicroscopy.org/job/OMERO-5.1-merge-push/145/)