Merge metadata changes from upstream r643
Generated Python files for metadata
Move out of beta status.

Fixes #30
Merge metadata changes from upstream r644
Generated Python files for metadata
Bump version to 5.9.2
Merge metadata changes from upstream r645
Update copyright date in generated files
Generated Python files for metadata

Includes some changes missed in previous regenerations
Merge metadata changes from upstream r646
Generated Python files for metadata
Add information in README about size of geodata