Cookie-based Permalink/ArgParser-workalike

[openlayers]

Store position, zoom and layers in a cookie, like openstreetmap.org now has.

[euzuro]

this is an interesting idea. the patch/idea is way too big to fit into 2.7, though, so I'm sliding it into 2.8 so that we consider it then.

[crschmidt]

This code hasn't been updated in a year and doesn't have a champion right now; bumping to after 2.8, at which point we can work on it more.

[jpulles]

Probably the solution for this feature should take into account that a page can have multiple maps and that a site can have multiple pages. For multiple maps on a single page it would be sufficient to use the map id as a cookie key. I'm working to take the multiple pages into account. In case you are interested, the patch only modifies ArgParser and Permalink; ArgParser optionally saves that state in a cookie, Permalink uses the cookie if set. The values in the cookie take precedence over the values in the command line.

[erilem]

Bumping again. Old patch, that doesn't apply to current trunk, and that doesn't include tests.