Create XML Format for cross-browser generation of namespaced XML docs

[crschmidt]

Currently, there is a variety of code spread across OpenLayers.Ajax and OpenLayers.Util for working with XML formats in cross browser way. Encapsulate that, and use it throughout the OpenLayers code, so that things like OpenLayers.Format.GeoRSS work cross-browser.

Work has been started on this in Tim Schaub's "XML" sandbox.

[crschmidt]

#535 should be solved by the work in this ticket.

[crschmidt]

#733 is also a duplicate of this ticket.

[crschmidt]

#536 should also be solved by this ticket.

[tschaub]

cross-browser xml tools

[tschaub]

I'll happily commit if approved.

[crschmidt]

I agree that this appears to be a replacement for everything we need as far as XML creation/parsing goes at the current time. It works, all tests pass, and IE, Safari3, Opera 9 all seem to do the right thing.

Please commit.

[tschaub]

in with r3862