Fix redirected link to OMERO features list page
Redirect Matplotlib URL
Fix redirected Github source code links
Fix miscellaneous redirected links
Fix redirected links to OME products downloads pages
Remove unused feature_plone extlink
Remove doi extlink and use jcb link for clients overview page
merge dev_4_4 -D org -I include -E conflict -E needs-fixes -E broken: PR 245 (Add note about Java UTF-8 source in Insight.)
merge dev_4_4 -D org -I include -E conflict -E needs-fixes -E broken: PR 257 (Redirected links)