A minor update to add some bug fixes and improvements.

Changelog:

• Added a little more info and a note to the netmap manual to explain it's not available in all OS versions, same with the telnet one.
• Added more info to the devices' manuals to make it clearer that a telnet connection needs to be established with them to use the commands.
• FIXED: the player could go around some of the vertical pipes in level 14.
• FIXED: the lift could still be climbed in the middle position.