* Added wrapper to use PYTHON environment variable in tests
* Added unicode comment to default test config
* Changed config objects to use locale encoding
* Changed to use byte buffers for config (re-)writing
* Added tests for unicode sensitive tools

Configuration: simplified commented namelist settings at the end of a group by adding a special variable '.end'

Namelist groups may be disabled by setting the special variable '.hide' to 'true'. This allows to selectively re-enable groups in higher order config files by setting '.hide' to 'false'

Global/Templates: changed version info to be retrieved from version control system; changed 'mkexp_input' variable to show package version

mkexp: changed 'get_file' function to return unknown variable references unchanged, added 'get_dir' function, returning the path for a given 'files' section

mkexp: changed 'list' filter replacement to map the empty string to an empty list. Added option to keep empty string as singleton list if needed