Initial compose-mode implementation.
Some after-send-hooks to improve experience
Rename before-functions
Implement asking
sx-answer to start composing from the question buffer
Add an answer button
Prettier comment button
Fix doc
Simplify update-display code
Editing implemented

Fix #11
Fix bug introduced by new use of overlays.
Implement a command for asking.
Fix up asking logic
Refactor sx-compose-create
Header Commentary to sx-compose
Header Commentary to sx-interaction
Header commentary on sx-button

Affects #123
Not adamant
Merge branch 'master' into answering

Conflicts:
	sx-question-list.el
	sx-question-print.el
	sx-tab.el
Extend sx--data-here