View lcov test coverage results on http://www.ufoot.org/liquidwar/v6/doc/coverage/src/lib/cns/index.html.
callback: handler function.
Installs a console handler.
Return value: none.
Polling function for console, must be called on a regular basis.
Return value: none.
line: line to add
Adds a line to the console history, won't add it if it's NULL or empty.
Return value: none.
Tells wether console is supported.
Return value: 1 if console can be enabled, 0 if not
Tells wether program is likely to have proper term (xterm, Linux console) support.
Return value: 1 if has validated TERM support, 0 if not