Google Maps support should deal with converting between coordinate systems

[dom]

This is largely so that UK grid coordinate based guides work - they are currently based on the Airy system but we need to feed Google Maps WGS84 data. For now those guides have to use force_wgs84 and have their points out by some 10s of metres.

[dom]

https://secure.mysociety.org/cvstrac/getfile/mysociety/perllib/Geo/HelmertTransform.pm?v=1.4 is a possibility but this is released under a licence which may not be DFSG free so not something we want to use.

Nick has volunteered to port his Python implementation if needed.

[dom]

Emailed author of Geo::HelmertTransform? about licensing.

[dom]

I have now agreed to upload Geo::HelmertTransform? to CPAN so will be able to address this ticket once I've done that.

[dom]

Andy Armstrong has code for this too so this may wait for that to happen.

[nick]

(In [870]) Support doing Helmert Transforms as required, using the MySociety? Helmert transform library, if installed. References #89

[nick]

(In [872]) Do the wgs84 convertion for the google maps page. Add tests for this too. References #89

[nick]

Fixed version of MySociety?'s Geo::HelmertTransform?

[nick]

If you install (the fixed version - attached to ticket) Geo::HelmertTransform?, and set your geo_handler as required, then OpenGuides will now convert properly, and your google maps will be in the right place

[dom]

Now in CPAN, so done.