Add support for reconnecting to OSCam

Fixes #28
Do not obtain PMT if OSCam socket is not connected
Use LOG_INFO and LOG_DEBUG for info and debug messages
Revert "Do not obtain PMT if OSCam socket is not connected"

This reverts commit cdb3ac3dd502a7c66e7a0b1a69d664606e90b004.
The socket was created even if there was a problem obtaining PMT data;
moreover, its fd was lost in the control flow in this cases.
It's better to obtain PMT first, and create a socket afterwards.
list management: try to handle LIST_ONLY properly

This should fix zapping sometimes after tune problems.
version 1.0.5