increased number of digits for increased precision of scaling


git-svn-id: https://pycam.svn.sourceforge.net/svnroot/pycam/trunk@1249 bbaffbd6-741e-11dd-a85d-61de82d9cad9

moved data file location handling to a separate module
moved most model handling functions to separate "plugins"
created a basic "core" handler for settings, widgets and events


git-svn-id: https://pycam.svn.sourceforge.net/svnroot/pycam/trunk@1061 bbaffbd6-741e-11dd-a85d-61de82d9cad9