Add functions to convert between WGS-84 and OSGB36#2

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natmchugh wants to merge 10 commits intophp-geospatial:masterfrom

natmchugh:master

Commits on Oct 9, 2012

first draft at a helmert transformation
Nathaniel McHugh
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Commits on Oct 11, 2012

* converts from polar to cartesian based on Airy 1830
Nathaniel McHugh
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Commits on Oct 14, 2012

* trasform polar to cartesian co-ords
Nathaniel McHugh
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* apparently - height is correct
Nathaniel McHugh
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Commits on Oct 18, 2012

* better set up of constants
Nathaniel McHugh
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Commits on Oct 19, 2012

* move constants into structure and allow reverse helmert
Nathaniel McHugh
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Commits on Nov 3, 2012

add 2 new functions to convert co-ord formats
Nathaniel McHugh
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Commits on Nov 7, 2012

clean up names and prototypes
Nathaniel McHugh
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Commits on Nov 9, 2012

* spaces to tabs
Nathaniel McHugh
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Commits on Nov 21, 2012

* fix spacing in copyright notice
Nathaniel McHugh
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