Ability to set umask #649

Is your feature request related to a problem?

Not necessarily a request, but a possible feature discussion.

Describe the solution you'd like

Hi Xavier--
I have a need to set umask in a module I'm using to set up a project environment.

Describe alternatives you've considered

Right now, I'm just using puts "umask 0077; " to have it eval'd with the rest of the shell eval output. And that's not a bad solution. It's just kind of a hack, and I imagine most casulal module user's wouldn't understand it when reading it. It's shell independent. And even though I haven't tried, I'm sure I get module unload to work right as well.

(BTW, On the high-module-count caching improvements: "I'll be back". The guy pushing me the most on it left the company. But I still want to finish it.)