Added crs converter function and test

[osundwajeff]

Ticket #9

Reprojects CRS fucntion and tests.

[timlinux]

Isnt it a bit wasteful to copy each working layer into a new version of the same layer in a different CRS? We should be able to reproject features on the fly into any CRS which is a fairly inexpensive operation. Or do you have a specific use case in mind?

[osundwajeff]

No @timlinux, I don't have any particular use case. I used the function as it is direct, I didn't factor the memory bit.
I'll update the function to reproject on the fly instead.

[osundwajeff]

@timlinux Upon looking at this further, I think reprojecting the object is a better approach as all the geometries will be converted to the new CRS and if there is any computation that will require using the geometries in the new CRS, it will be more accurate.
An example would be getting the extents/bbox of a boundary in utm, by using on the fly reprojection the geometries remain in WGS 84 / EPSG: 4326.

Reprojecting: