[AppDB] - Add fuzzy matching to appdb searches

[Chris Morgan]

search.php, include/util.php
Chris Morgan <cmorgan at alum.wpi.edu>
Add fuzzy matching using php's similar_text.  Default to using 60% minimum 
match.  Show fuzzy matches below the 'like matches' table so users can tell 
the results apart.  Exclude like matches from fuzzy match results to avoid 
duplicate results.


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