mout: Miscellaneous functions for outputting via message()
Description
Miscellaneous functions for outputting via message().
These "m*" methods work analogously to their corresponding "*" methods
print(), cat(), show,
str, and printf() but uses message()
to output the content, which in turn outputs to standard error.
The mout() method can be used for all other output methods,
e.g. mout(write(x, file=stdout())).