reverse point order of polygon to counter-clockwise

[pvgenuchten]

Overview

counter clockwise is expected

Related Issue / Discussion

#1107

Additional Information

Contributions and Licensing

(as per https://github.com/geopython/pycsw/blob/master/CONTRIBUTING.rst#contributions-and-licensing)

• I'd like to contribute [feature X|bugfix Y|docs|something else] to pycsw. I confirm that my contributions to pycsw will be compatible with the pycsw license guidelines at the time of contribution.
• I have already previously agreed to the pycsw Contributions and Licensing Guidelines

[pvgenuchten]

superseded by #1109

[pvgenuchten]

actually #1109 does not solve #1107 (it only applies to explicit envelope bounds), so this PR is still relevant