several fixes about command helps
several fixes about command helps

- add help on command help
- add bold in do_help instead of get_command_help
- get_commands_doc() returns full help

RouxRC/weboob,RouxRC/weboob,laurent-george/weboob,yannrouillard/weboob,willprice/weboob,sputnick-dev/weboob,Konubinix/weboob,Konubinix/weboob,yannrouillard/weboob,sputnick-dev/weboob,willprice/weboob,nojhan/weboob-devel,Boussadia/weboob,Boussadia/weboob,frankrousseau/weboob,laurent-george/weboob,sputnick-dev/weboob,laurent-george/weboob,Konubinix/weboob,nojhan/weboob-devel,RouxRC/weboob,yannrouillard/weboob,frankrousseau/weboob,frankrousseau/weboob,willprice/weboob,Boussadia/weboob,nojhan/weboob-devel,Boussadia/weboob