Request to add support to automatically check for and resolve conflicts when loading environment modules

[noahv]

Request to add module_unload support to MTT plugins which don't have the unload support (Autotools, AlreadyInstalled, Git).

Request to add support to automatically check for and resolve conflicts when loading environment modules.

[ribab]

@noahv -- this is already done, right?

[noahv]

There is no support for the second request for resolving conflicts.