More fully implement Circle and Position. Implement Box and Polygon. Replace runtime exceptions with a StcsParsingException that can be caught.
More fully implement Circle and Position.
Implement Box and Polygon.
Replace runtime exceptions with a StcsParsingException that can be caught.

git-svn-id: 311fcc5b8b03427d323cee07bbb9e5a14d8d22e9@229 728ff76a-78ac-11de-a72b-d90af8dea425

opencadc/core,opencadc/dal,opencadc/core