Fixed formatting of file types filters separator string in MainWindow::loadFile.
QFileDialog now correctly displays file names even in (buggy?) Kubuntu linux.
Fixed file types filter string separator character in MainWindow::saveFile.
Saving files nolonger results in a "bad argument" error.
Another fix in filetypes filters in MainWindow::loadFile()
Could not iterate over all known file types. Some were for saving only.
Merge pull request #98 from erwi/master

fix to load/save problems in Linux