Vegas

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Again a very minor update, to respond to a feature request.

- Adds mpi keyword to Integrator. Setting mpi=False disables mpi support in
vegas even if mpi is available; setting mpi=True (default) uses mpi
automatically (so long as it is installed).

- Improved documentation on the use of C and Fortran with vegas.

- A new section in the tutorial on how to calculate distributions with vegas.

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Very, very minor update.

- Fix compatibility issue with v11 of lsqfit.

- Improved pypi documentation.

- Improved makefile.

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Minor update; minor bug fixes.

- Documentation fixes.

- Fixed bugs associated with parameters minimize_mem=True and beta=0.
These resulted in sub-optimal behavior.

- New timing information in vegas.reporter(). Also flushes stdout after
each iteration.

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Tiny change to test scripts to account for changes in numpy.

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- Improved installation script, especially when cython and numpy not
installed. cython is no longer necessary. numpy and gvar should be
installed automatically if they are not present.

- Trivial changes to tests.

- Slight rearrangement of documentation.

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Bug fix (in setup.py) to address installation problems on some systems.