Profilehooks

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- Changed licence from GPL to MIT.

- New decorator: timecall

- New arguments to profile: skip, filename, immediate.

- Added support for profile, after becoming convinced hotshot was unreliable.
Made it the default profiler.

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- First public release (it didn't actually have a version number), announced on
my blog: https://mg.pov.lt/blog/profiling.html

- profile and coverage decorators that didn't accept any arguments.

- hotshot was the only profiler supported for profile, while coverage used
trace.py