Implement hflynn's suggestions.
Clarify legacy data policy.
Add comma.
Make future plans more concrete.
Update download link in read me
Rephrase and bold text.
Adding ome 5 to product menu
Updating omero_plone links & removing unnecessary
Removing ref to screenshot product page too
Remove substitution from nested markup.
Cpp: Document use of -fpermissive
merge develop -D org -I include -E exclude: PR 369 (Cpp: Correct content and markup)
merge develop -D org -I include -E exclude: PR 383 (Updating User index page & demo server for FS)
merge develop -D org -I include -E exclude: PR 385 (Add doc regarding FS server migration (see #10964).)
merge develop -D org -I include -E exclude: PR 386 (Update download link in read me)
merge develop -D org -I include -E exclude: PR 387 (Adding ome 5 to product menu)
merge develop -D org -I include -E exclude: PR 389 (Updating omero_plone links to point at OME 5 product pages)