Flag to get information about the compiler and RTS

There should be a flag +RTS -foo that prints info including:

• The version of GHC used to compile the program
• The sort of RTS linked against
• What (canonicalised) platform it was built for, i.e., powerpc-apple-darwin8.10.0

There should also be a flag that can be given to the compiler that prints info including:

• Whether it has a NCG
• Whether or not it is registerised
• Whether it supports ghci/ghc -e
• What RTSs it has
• Whether it supports SMP

Ideally this would all be easily machine-parseable.