Posix pipe inputs might respond to CPR

Issue # 5 from this gist

It'd be nice to be able to configure whether a posix pipe input responds to CPR. It is currently forced to False:

Lines 39 to 41 in 9e3845a

     @property  
   def responds_to_cpr(self):  
   return False  
 

But this pipe might be connected to a vt100 terminal that supports ANSI codes. A good example of that is TelnetConnection.vt100_input:

Line 112 in 9e3845a

self.vt100_input = PosixPipeInput()

In this context telnet_connection.vt100_input.responds_to_cpr returns False even though CPR is most likely supported.

Also, all the tests seems to pass with PosixPipeInput.responds_to_cpr forced to True instead.

Provide feedback