decode and log request URLs; closes #125

as processing of a HTTP request begins (GET, HEAD, PUT, POST, ...),
the original query line is printed in its encoded form. This makes
debugging easier, since there is no ambiguity in how the client
phrased its request.

however, this results in very opaque logs for non-ascii languages;
basically a wall of percent-encoded characters. Avoid this issue
by printing an additional log-message if the URL contains `%`,
immediately below the original url-encoded entry.

also fix tests on macos, and an unrelated bad logmsg in up2k

tests/util.py

@@ -33,14 +33,6 @@ def eprint(*a, **ka):
     sys.stderr.flush()
 
 
-if MACOS:
-    import posixpath
-
-    posixpath.islink = nah
-    os.path.islink = nah
-    # 25% faster; until any tests do symlink stuff
-
-
 from copyparty.__main__ import init_E
 from copyparty.broker_thr import BrokerThr
 from copyparty.ico import Ico