refs #7022. Use relative paths fix.
refs #7022. Fix to not disabling image download properly.
Add dialog images to qhp file reference.

If they are not listed in this file then they don't show up even if the
link looks correct. Refs #7022
Fix for when not downloading. Refs #7022
refs #7022. Paths separators incorrect.
refs #7022. Try different separator.
Merge remote-tracking branch 'origin/feature/7022_alg_dialogs'