Fix bug in string formatting
Fix bug in string formatting

Plain " in a string should be slash-protected.

pbrunet/pythran,hainm/pythran,hainm/pythran,artas360/pythran,serge-sans-paille/pythran,pombredanne/pythran,pombredanne/pythran,artas360/pythran,hainm/pythran,artas360/pythran,pombredanne/pythran,pbrunet/pythran,pbrunet/pythran,serge-sans-paille/pythran