add matched messages count in progress bar

[digizeph]

instead of only showing the estimated time left, we should also show the number of matched messages to give a hint to user whether the search is successful or not. for some big search queries, having that hint might allow users to quit early and revise the search queries.

From

[00:05:48] ###################---------------------     189/412     6m

To

[00:05:48] ###################---------------------     189/412     6m 3456 messages found