Newpct: some improvements

Thanks to @raistlin2912 tests, we've detected some things to improve:

- Change param "category_" from search, high resolution torrents were
not being returned with previous value.
- Change "bus_de_" param from RSS search to improve search speed.
- Change regular expresions from _processTitle method to be more
generic.
- Change "is not" conditions by "!=" (PEP8)