GSoC20 candidates workflow

[sitaochen]

Below are the changes in this pull request:

• Convert candidate page to use templating engine and delete candiates when published:
  • Converted individual candidate page and candidate index page to template-based generation like servePackagePage does
  • Added two html templates, candidate-page.html.st and candidate-index.html.st, for these pages
  • Delete candidates automatically after they are published by setting doDelete to True
• Added publish button on candidate page and show a link to the candidate packages available from the main package:
  • Added publish button on candidate page so users can publish the candidate directly
  • Added candidate section on the main package page with links
• Added candidate link on user page:
  • By adding candidate link, user could go to the candidates page of that package.
  • The link would be wrong if the maintain group is a candidate
• Added delete all candidates button on candidates page:
  • Added delete all candidates button on candidates page, which redirect user to a candidates delete form
  • Created a candidates delete from to delete all candidates of a package
• Expose Web UI for package candidates documentation:
  • Created Web UI for candidates to upload documentation
• Fixed links in Web UI for package candidates documentation:
  • Fixed the link on doc upload success page of candidates

[gbaz]

Doing some final review before merge. Can you move the "candidate" section on the main page into the maintainers corner rather than the sidebar?

[sitaochen]

ok