refactor samples, remove OS dependencies

[Reimar Bauer]

In Windows wie have HOMEPATH while in linux it is HOME

We should check the examples to use sys.platform

[Joern Ungermann]

Sounds good to take this into account. On my Windows7 system HOMEPATH does not give an absolute path...

There may be something in a python standard module to help us: This from os.path import expanduser home = expanduser("~") is supposed to work on all platforms. From quick testing, it works on my Windows7 machine and ob debian Lenny.

[Reimar Bauer]

With the refactoring of mss to use a json config file and also start without that in place we have now a tempdir in place. Other places may also call tempfile.gettempdir()

wms_cache=config_loader(dataset="wms_cache", default=os.path.join(tempfile.gettempdir(), "mui_wms_cache")))

The default can be overwritten by the entry in the json file.

[Reimar Bauer]

This was during many commits solved, most was done by refactoring mss to use a json config file with sane defaults and the other parts with refactoring the server code and configs.