test-client-custom-summary: Added various tests

test-client-custom-summary: Added various tests

  o Added test for the underscore

    Before we used to only escape the '%' character in LIKE statements,
    but SQLite also recognizes the '_' as a single char wildcard and
    needs escaping.

    This test ensures that the underscore is properly handled.

  o Added query test which ORs the same field

    This helps to test the query optimizer in EBookBackendSqlite, which
    will optimize a query which ORs two multi attribute fields (like
    E_CONTACT_EMAIL).

  o Added tests for the NOT queries

  o Added tests for NOT, AND and OR and as well as some nested AND / OR
    tests which trigger the query optimizer in EBookBackendSqlite

  o Fix expectations for phone number matches, now that the phone number
    comparisons are fixed

  o Added --filter option.

    Pass a regular expression to filter which test cases should run

  o Added test which searches by UID (can trigger bugs if normalization
    is mistakenly done on the UIDs).