EnsembleFrame Refactor Milestone 3: The ObjectFrame and SourceFrame

[dougbrn]

#191 Milestone 3 focuses on the creation of the ObjectFrame and SourceFrame subclasses. Both classes inherit from the EnsembleFrame class, but enforce specific formatting requirements as currently required by the object and source tables. These requirements are:

• Enforcement of a Object ID as the index for both
• Column Mapping of critical columns
  • SourceFrame: [id, time, flux, error, band, provenance (optional)]
  • ObjectFrame: [id, nobs_total, nobs_{bands}]

Currently, the tape.utils.ColumnMapper class does this mapping using a single set of columns that are not divided between object and source. One aspect of this milestone may be to adjust how the ColumnMapper approaches the ObjectFrame and SourceFrame, so that critical columns are better tied to each specific frame.