[options] Add --no-call-home

While we're at it, also drop "experimental" moniker for --call-home - should work fine.

youtube_dl/YoutubeDL.py

@@ -213,8 +213,8 @@ class YoutubeDL(object):
                        - "detect_or_warn": check whether we can do anything
                                            about it, warn otherwise
     source_address:    (Experimental) Client-side IP address to bind to.
-    call_home:         (Experimental) Boolean, true iff we are allowed to
+    call_home:         Boolean, true iff we are allowed to contact the
-                       contact the youtube-dl servers for debugging.
+                       youtube-dl servers for debugging.
 
 
     The following parameters are not used by YoutubeDL itself, they are used by

youtube_dl/options.py

@@ -508,7 +508,11 @@ def parseOpts(overrideArguments=None):
     verbosity.add_option(
         '-C', '--call-home',
         dest='call_home', action='store_true', default=False,
-        help='Contact the youtube-dl server for debugging. (Experimental)')
+        help='Contact the youtube-dl server for debugging.')
+    verbosity.add_option(
+        '--no-call-home',
+        dest='call_home', action='store_false', default=False,
+        help='Do NOT contact the youtube-dl server for debugging.')
 
     filesystem = optparse.OptionGroup(parser, 'Filesystem Options')
     filesystem.add_option(