Pressing After 0.10.x:
----------------------

* Write a unit test for the run_command function.

* Add a feature to add a dot after the number in the title.

Long Term:
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* Multiple stages for slides.

* quadp copy, quadp rm, quadp mv commands.
    - quadp order meta-command

* Create a unified approach for setting credits for the lecture: E-mail,
homepage URL, writer's name, etc.
