Search: Don't post form until search

[David Sutton]

Currently when updating the search parameters, the page is updated on each change to the time, date, or any other field. This should not happen until the user presses the search button and is actually asking to receive the data back.

This should make the page more usable and understandable for most users.

[Alan Noble]

Implemented in https://bitbucket.org/ausocean/vidgrind/commits/97b305d34273b9bb4541e9a2be1836082a773455