Vegas

========================
Small bug fix to previous bug fix.

=========================
Small bug fixes.

- Adds left-out part of the bug fix in 3.4.2.

- Fixes problem that could sometimes lead
gvar to complain about non-symmetric
covariance matrices. Thanks to
Jolyon Bloomfield for pointing this
out.

========================
Bug fix for situations where the error in the answer
is smaller than 1e-8 times the answer -- ie, unlikely
to affect many existing codes. The old code reported
cumulative errors that were too large. (Thanks to
Gabriele Spada for pointing this out.)

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Minor documentation update; can be ignored otherwise.

- Updates examples to account for changes in mpirun.

=======================
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.

==========================
Very, very minor update.

- Fix compatibility issue with v11 of lsqfit.

- Improved pypi documentation.

- Improved makefile.