DOC: add description of implementation and socket_proxy config options

examples/pycaosdb.ini

@@ -46,7 +46,8 @@
 # supply the matching key (pem file):
 # cacert=/path/to/caosdb.ca.pem
 
-# If this option is set, the SSL certificate will be ignored.  Use with care!
+# If this option is set, the SSL certificate of the server will not be
+# validated. This has the potential of a man-in-the-middle attack. Use with care!
 # ssl_insecure=True
 
 # You may define the ssl version to be used. It has to be the name of the
@@ -54,7 +55,10 @@
 # ssl_version=PROTOCOL_TLS
 
 # You can define a socket proxy to be used.
-# socket_proxy=
+# This is for the case that the server sits behind a firewall which is being
+# tunnelled with a socket proxy (SOCKS4 or SOCKS5) (e.g. via ssh's -D option or
+# a dedicated proxy server).
+# socket_proxy=localhost:12345
 
-# You can define the connection implementation to be used.
-# implementation
+# This option is used internally and for testing. Do not override.
+# implementation=_DefaultCaosDBServerConnection