Dashboard search predictability improvements

[zanecolesmith]

The way TreeSnap handles keywords in searches by category could use a general review, but here are two examples of how the dashboard search function behaves unpredictably.

1. Case sensitivity returns differing results in the TreeSnap web dashboard for species in the "Other (custom entry)" category, submitter, location, etc.

Examples:
Lower case:

Upper case:

2. It would be helpful for searches to "contain" keywords instead of enforcing "starts with" behavior. It's a bit hard to tell, but it seems like some keywords might have "starts with" and others may have "contains" behavior. Some entries appear unsearchable by species due to search keyword implementation:

Examples:
Search by collector to return species in Other category:

Search by species in Other using species keyword returns no results: