Revbump to 0.5.0-dev.
Change check_ptrace_protection so it only warns, not errors.
Move it to the bottom of the install script so it errors right before the completion message.
Recommend setcap instead of disabling ptrace protection completely.
Add check for python2.
Add requirement to have git.
Add qfconvert from repo.
Add Chromafort. Fix a few minor errors.
Fix comment.
Add DF Announcement Filter 1.01.
Add DF Therapist manual.
Add cheatsheets.
Revert "Add cheatsheets."

This reverts commit 6c1063d9c1983e78ed633a56fb6c46c1b1cfb18a.
Revbump to 0.5.0.