test: improve check_int()

So that the msg is optional.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Add support for 'pause' command

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
doc: rename manpage file

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
doc: update options

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
doc: add description

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
doc: add missing instruction commands

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
doc: cleanup . command

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>