use a separate open directory for .ini and logs

[caver456]

Right now, .ini is in the same directory as the host, so making it editable is not a great idea - on mac, even if the .ini has write permission, the directory would still need write permission for the file to be editable, and it would be best to not make the host directory editable.
Log files are saved in the user's home directory, which should not be too much of a problem, but is not really 'clean'.
Make a single directory to hold log files and gpsio-host.ini. Normally on mac/linux this could be something like ~/.gpsio; what's a good location on Windows?