[web] Don't quote &

Obviously
[modules] Don't quote uri in cases where web.get does it for you

In the most common cause, where you have http://example.com/thing?a=b&c=d,
web.py functions will quote the "query string" part. You don't need
to quote it twice.

In some other cases like tumbolia (in calc.py), there is no "query string"
so manual quoting is still needed.