: Minor changes & documentation

Here are a few `easy' patches in between.

Patch 1: Simplifies the macro used for DCCP debug messages
(debugging is no longer automatically on for static builds, uses
kernel commandline instead)

Patch 2: More debug information for dccp_wait_for_ccid
I have found this very useful when debugging error cases. (With Arnaldo's ctracer, it seems there is now less need for this :-) In particular: the `delayed by' statement is helpful and catches an earlier statement used by Ian in ccid3_hc_tx_send_packet.

Patch 3: Add missing documentation for CCID 3 socket options

Patch 4: More output in dccp_probe
dccp_probe is such a nice tool that I think it makes sense to add a few more fields. I have added a few scripwhich can be downloaded from:
http://139.133.210.30/users/gerrit/dccp/dccp_probe/

Example output is on
http://139.133.210.30/users/gerrit/dccp/dccp_probe/examples/

(I have an explanation why the plots come this way, this follows later).