Added method void AsciiOpenDlg::resizeWidthToFitTableColumn()
This expands the width of the dialog window in order to make all
the data columns visible without having to manually resize the dialog.
In case the opened file only contains a few columns of data, the
table columns are expanded instead to fill the whole available width
without affecting the dialog size.
Merge pull request #149 from erwi/master

Added method void AsciiOpenDlg::resizeWidthToFitTableColumn()