post-lab 10 modifications

[aaronbloomfield]

They need to enable stdin input (via -) so that we can run their code such as:

cat file.txt | ./encoder - | ./decoder -

So a description about how to switch between the two input streams (file and stdin), as well as the requirement for stdin input, needs to be added. This will also require a change to the execution entry in the grading system.

[aaronbloomfield]

While this would make it easier for grading their code, it does not work well with the lab requirements, which require rewinding the file input. So closing this issue without resolving it.