By using the local 8-bit character set we can allow local non-ASCII
characters in file paths, for example user account names on MS Windows
with characters in the default code page.
Make calibration solution application iterative so that calibrations
can be applied sequentially if desired.
Tidy up calibration solution messages boxes and make i18n friendly.
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@8153 ab8295b8-cf94-4d9e-aec4-7959e3be5d79