Avoid default outputformat initialization

[tbonfort]

We currently initialize all the default outputformats each time the mapfile is parsed, which causes some overhead knowing that only one of them will be used.

The full list of available outputformats is only necessary when creating capabilities documents.

This ticket tracks the following modification:

• remove call to creation of all default outpuformats in postMapOutputFormatSetup
• add function to create a default outputformat only if it is requested
• add calls to creation of all default outputformats before capabilities documents are created.

After discussion with Frank, we have not identified other side-effects, do you?

[sdlime]

Not off the top of my head, solution sounds reasonable...

Steve

[warmerdam]

Implemented during the sprint week by Thomas.