change cap style from round to square, and join style from round to bevel, to help speed
change cap style from round to square, and join style from round to bevel, to help speed

git-svn-id: 77c6ae948ca0f9b1480c5330e5e23bcf0afa938f@13131 fdbf22ae-c210-0410-be80-ca943da6b8f8

NOAA-PMEL/PyFerret,NOAA-PMEL/PyFerret,NOAA-PMEL/PyFerret,NOAA-PMEL/PyFerret,NOAA-PMEL/PyFerret