Make Constraints of Floating Axes More Robust

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The current system of constraints takes the initial geometry of an axis, and 
applies updates accordingly. 

A more robust scheme would be to allow constraints to be declared explicitly. 
Eg. 'The axis should remain 20px from the left border of the plot area'. 'The 
axis should remain 50% of the way across the plot area.'

The existing CPTConstraints struct should be generalized to a class, and be 
capable of handling the types of constraints described above.

Original issue reported on code.google.com by drewmcco...@mac.com on 7 Jun 2011 at 10:57

[GoogleCodeExporter]

This should also fix issue #125.

Original comment by eskr...@mac.com on 31 Jul 2011 at 2:15

• Changed state: Started

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This issue was closed by revision 2926326f8a54.

Original comment by eskr...@mac.com on 5 Aug 2011 at 2:37

• Changed state: Fixed