Resources: embiggen finding aid data fields
EAD import: indicator values are nodes within <container>s
EAD import: normalized dates and misc date attributes
EAD import: fix typo and add comments for later fixes

When importing notes, we should remove the first <head>
tag since it's already being added to the `label` or
`title` property depending on type
EAD import: make `ingest` default for name/subject `source`
Merge pull request #562 from anarchivist/finding-aid-data-ead-import-fixes

Finding aid data and EAD import mapping changes