Minor fixes
Merge pull request #656 from hflynn/downloads_links

using latest-develop redirects for downloads
merge dev_5_0 -D org -I include -E exclude: PR 640 (Update docs for import and logging fixes)
merge dev_5_0 -D org -I include -E exclude: PR 653 (Update documentation to use Pillow instead of PIL)
merge dev_5_0 -D org -I include -E exclude: PR 658 (Improve server-template description in advanced configuration (rebased onto develop) (rebased onto dev_5_0))