Add Surface3DChart support
Python 3 compatibility.

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branch : 1.8
Move fixtures to central conftest file.

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Basic py.test configuration

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Format warning about charts.

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Add development notes to TOC

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Test configuration handled solely by tox to avoid race condition problems with dependencies.

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Sample file for adding images.

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Reverted image count.

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branch : 1.8
Added comment reading testdata

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branch : 1.8
extra : rebase_source : 59cdb71bd721d1c7be78db7cacf4fafa955e84af
Added function to determine location of comment files based on contents of rels files

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branch : 1.8
extra : rebase_source : 37e50387334c86a093e6327d8b068d9490b4c2f9
Added function to read comments from an XML string

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branch : 1.8
extra : rebase_source : 0eb524dd7c1536624f107008a98b2e9711c1b473
Some cleanup

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branch : 1.8
extra : rebase_source : 688d936a069438b7d51f97c57a7e51bea6410254
Completely forgot to test

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branch : 1.8
extra : rebase_source : d3226af03b082217add182d1bded7b6eff6e5487
Comments are now read and assigned to their cells. Basic unit test also included (and passes)

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branch : 1.8
extra : rebase_source : fcc9171b8d2705a5644635229c5e93d4d57d7e08
reverted mistaken change

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branch : 1.8
extra : rebase_source : b0c195f82828b85bb3050ff86d00dcb08493813b
Fixed other mistaken changes

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branch : 1.8
extra : rebase_source : 5a3e15b1d7183ad9dedc5730a7b0c3c69ffb0fef
Better unit tests

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branch : 1.8
extra : rebase_source : 4bf0f3a0b9b40ad96d02f402fd824bccb37ea120
Added self to authors file

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branch : 1.8
extra : rebase_source : 3a9dacd9529ce01029d765be39260f1639f66476
Added documentation

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branch : 1.8
extra : rebase_source : 58ea6178340b7f221843acde18e823c5230da118