Add search by application number (#3294)

Fixes #3289

What's on the tin.  A few notes:

* I preserved the git history from our repository, but can easily squash
them all if you'd prefer such a small change be in one commit
* I'm not sure where in the documentation to document this feature

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Co-authored-by: Chris Zubak-Skees <chriszs@gmail.com>
Co-authored-by: Chris Zubak-Skees <chriszs@opentechstrategies.com>
Co-authored-by: Ghulam Murtaza <gmurtaza@opentechstrategies.com>
Co-authored-by: Frank Duncan <frank@kank.net>