Create an environment status dictionary for STIPS

[york-stsci]

STIPS should have an environment status dictionary (or function that creates one) on import, which provides information such as:

• STIPS version
• STIPS_DATA location
• STIPS data version
• Pandeia version
• Pandeia data version
• pandeia_refdata location
• webbpsf version
• WEBBPSF_DATA location

Possibly there should also be a convenience function or two that make a string out of this information. This will hopefully make it easier to compare versions and environments when (e.g.) a particular version works for one person but not another.