global queue thread suggestion

I'd like to suggest that # of threads be configurable for individual sites within the global queue. Otherwise, when dl'ing from a site that allows multiple threads, smartftp tries to establish multiple threads with ALL of the sites listed in the global queue, and this is seen as improper etiquette by many site ops and can lead to being banned.

Ethan

This is a very good idea (if there isnt already a way to specify threads per remote viewer, there should be )