WEB-4925 Adjusted data search functionality to ensure taxon ignored if too big.

Put check into taxon query clauses to ensure taxon is searchable before adding
it to query. Adjusted flash notice to reiterate to user that results do not
include a taxon filter. Removed taxon from form input if it wasn't searched on
and added javascript to adjusted placeholder text temporarily to indicate it
has been removed.
Merge branch 'master' of github.com:EOL/eol