caltechlibrary/dataset: Major refactoring of code

The command line tool has been stream lined using a more Git like structure for associating options and verbs. A tentative sync command now can use a frame to synchronize collection data with a CSV file or Google Sheet (needs lots of real world testing). Documentation is been quickly revised to reflect most of these changes. The purpose of this release is to encourage internal Caltech Library use so we can get the bug reports to fix things properly. We're getting close to a feature set planned for v1.0.0.