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ever since the patch "Check with sysconf _POSIX_THREAD_CPUTIME", it
has been returning incorrect results, because the sysconf variable to
check should have been _SC_THREAD_CPUTIME, not _POSIX_THREAD_CPUTIME.

fixes problems when building with GHC 6.10 on Windows

This is much more accurate than getrusage, which was giving misleading
results when trying to time very quick operations like a minor GC.

The default should do into languageExtensions instead

This major patch implements the new OutsideIn constraint solving
algorithm in the typecheker, following our JFP paper "Modular type
inference with local assumptions".  

Done with major help from Dimitrios Vytiniotis and Brent Yorgey.

The main thing here is to allow us to provide type
signatures for 'deriving' bindings without pain.