[Orgmode] Added support for "habit tracking"

[John Wiegley]

There are really two kinds of TODOs on people's lists:

  1. Those whose importance is that they get done.
  2. Those whose importance is that they are done consistently.

I think most married people will know what I mean.  If you wash the  
dishes once after not having done it all month, you're not likely to  
win much applause.  But if you mow the lawn every month like  
clockwork, it's the regularity that does it.

Tracking habits isn't suited to a regular task manager, however.  You  
can see that the task needs to be done in your agenda, but you don't  
know if it's a task that sorely needs attention because you've been  
neglecting it, or if you've really been on the ball and don't _have_  
to do it today.

In the commercial world there is an app to address this kind of task  
called Sciral Consistency (http://sciral.com/consistency/).  I've been  
using it for about a year, and it's fantastic for making sure I keep  
up on my everyday duties, both at work and at home.

Well, I've implemented the functionality of Sciral for Org.  It works  
just as described on the Sciral webpage, complete with colorful graphs  
that appear to the right of the task name in the agenda buffer.  The  
graph even follows the same coloring algorithm as Sciral.

To test out this new feature, apply the attached patches and read the  
new manual section on "Tracking your habits".

John

0001-Improvement-to-org-repeat-re.patch
Description: Binary data

0002-Added-tagline-parameter-to-org-get-repeat.patch
Description: Binary data

0003-Set-day-of-week-in-result-from-org-parse-time-string.patch
Description: Binary data

0004-Added-some-missing-text-to-the-manual.patch
Description: Binary data

0005-Added-support-for-habit-consistency-tracking.patch
Description: Binary data