Add a module-level setting variable

- There's one more thing I'd like to do to this module.…I'm going to create a top level variable for this module…we're going to call it D J error log file.…And I'm going to give it a default…value of C errors dot txt.…Here in my module, if you remember,…back when we did error handling,…I set this up to write to that file.…I'm just going to have it use that…variable now, D J error log file.…

Whenever you create a module, Power Shell makes…everything in it visible to whoever loads the module.…You don't have to let that be the case.…If you've created certain variables…that are for internal use only, you can hide them.…It's a little bit of a backwards process.…You see, by default, if I don't…do anything, everything is made visible.…If I want some things to be hidden,…I have to explicitly export only those module…items that I want to be visible.…So I'm not really hiding something,…I'm taking the step to specifically…expose only those that I want to.…

So we're going to expose the get DJOS info function…and we're going to export the DJ error log file variable.…