Post first pass at exercises for module.

[davis68]

Here are some basic formative assessments for the module section.

[psteinb]

thanks. is this WIP or are you ready to merge?

[davis68]

Since there isn't lesson content yet, there's not a place to put it. Consider this a placeholder until there is text to scaffold these exercises in.

[psteinb]

ok, will do. thanks.

[markcmiller86]

One thing may be worth mentioning regarding modules is their impact w.r.t. scripts. In my experience, module commands entered at the shell prompt do not wind up having their effect in shell scripts invoked from that same shell. For example, you might execute a module command to set the compiler and then run a script that uses only the basename of the compiler (e.g. gcc). That invokation of gcc within the script may not wind up running the compiler you set when you interactively entered the module command at the shell prompt. One winds up having to include the module commands in such scripts to have the desired effect. I think this happens on multiple different computing centers here in the U.S.