Added a few docstrings and separator comments.

Author Pascal J. Bourguignon <pjb@informatimago.com>
Author date 2015-11-12 15:43:27
Author local date 2015-11-12 16:43:27 +0100
Committer Pascal J. Bourguignon <pjb@informatimago.com>
Committer date 2015-11-12 15:43:27
Committer local date 2015-11-12 16:43:27 +0100
Commit ffa0734ca2777f6582d035cb2b82516558f4bb5d
Tree f1fe54258309c4c90f1197c28685bb8bd262a1c2
Parent 5e9cc04dfde084ba5ebb3805aee1146b8c638be6
Added a few docstrings and separator comments.
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