Refactor write functions to use a flag instead of function pointers

[Sean Kauffman]

There are a couple of functions that take a function pointer as an argument so the code can be reused between the logging and output functions. We want to avoid non-constant function pointers, so refactor this to just pass a flag to a print function depending on which output they should use. This paradigm should be used in all the output functions that might be reused.

[Sean Kauffman]

I started working on this. It is not a difficult task but I haven't had time to finish it.

[Sean Kauffman]

Fix Issue #15: Refactor write functions to use a flag instead of function pointers

→ <<cset ae5619b7c188>>

[Sean Kauffman]

Now there is write_msg which takes a flag.