updating qwtpolar with latest source

updated qwtpolar with latest source (currently 1.1.1) by copying source files into qwtpolar-1.0 folder and renaming the folder to qwtpolar-1.1 (as 1.0 is outdated anyway)
there is still the qwtpolar-0.1 folder inside (historical?) which could be deleted too.
Mentioned in #1676

Compiling perfectly on debian using internal qwtpolar .

Signed-off-by: Werner Macho <werner.macho@gmail.com>