shapes.py: allow upper case formats in Drawing.save
shapes.py: allow upper case formats in Drawing.save

kanarelo/reportlab,Distrotech/reportlab,Distrotech/reportlab,Distrotech/reportlab,kanarelo/reportlab,kanarelo/reportlab,Distrotech/reportlab,Distrotech/reportlab,kanarelo/reportlab,kanarelo/reportlab