Update submit_datapackage_archive
Theme changes for metadata propagation button

Renders on edit metadata page from forms.xsl
Makes a javascript function call DryadPropagateMetadata
Implement DryadPropagateMetadata javascript

Shows /admin/propagate-metadata as new browser window
Initial implementation of transformer/form for propagate-metadata
Set framing to popup, fix POST url
Add name and values to checkbox
Install transformer for PropagateItemMetadataForm
Add i18n messages for Propagate metadata
Changes to Form/sitemap for POST vars
Remove transform parameters, verify eperson login
Use request.getParameters instead of parameters

Also some code cleanup
Initial PropagateItemMetadataAction
Change checkbox name to dataFiles[]
Implementation of PropagateItemMetadataAction
Implement recycle to prevent zombie fields
Display all values for a field

Metadata field positions are not known, so the propagation will simply copy all of the values for a given metadata field.
Convert camelCase to snake_case in JS and form
Fix bug - was getting file metadata again instead of pkg
Convert camelCase to snake_case in PropagateItemMetadataAction
Sort Data files by Item ID to ensure consistent ordering