FET 5.21.0 released

Version 5.21.0
- Updated the sources to Qt 5.2.0 (but the precompiled Windows version still uses Qt 4.8.5, because of various problems).
- Added print of advanced statistics directly from FET, suggested by Bobby Wise and implemented by Volker Dirr.
- Added an option to duplicate vertical names in the timetables, to the right of the tables (suggested by Pietro, implemented by Volker Dirr).
- Updated the Brazilian Portuguese translation, by Cloves das Neves.
- Added two example files from Brazil, by Werner Bruns.
- Added another sample file from Argentina, by pedrobordon.