Gvar

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- gvar.dataset.svd_diagnosis has new keyword process_dataset that
allows it to be used in more general contexts.

- Fixes bug that prevented Dataset from reading compressed files
in Python 3.

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Minor update.

- Simple arithmetic is now supported for BufferDicts having the same layout.

- Much improved the heuristic used in gvar.dataset.svd_diagnosis to suggest
an svdcut. The new heuristic gives lower estimates usually. Also has a new
option for the input data. And fixed bug that occasionally caused crashes.

- Adds new option (add_svdnoise) to gvar.svd. This is primarily for use
by lsqfit. Also modifies the return value to contain information related
to the SVD cut (dof, nblocks, ...) (instead of storing that information in
gvar.svd itself, which is a bad idea).

- New convenience function gvar.sample(g), which is the same as
next(gvar.raniter(g)).

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Very minor update.

- Fixes small inefficiency in installation script.

- Small optimization for cloning BufferDicts.

- load and loads now able to load files dumped using versions of
gvar older than 8.4. The old format is different.

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- Fixes bug in evalcov_blocks that missed out correlations in certain
unusual situations. This affects svd.

- Fixes incompatibility with latest numpy.

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Fixes bug in BufferDict that made certain types of dictionary key fail.

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Introduces new BufferDicts that are mostly but not completely compatible with
the old. The incompatible differences are in obscure features that were mostly
unused.

- BufferDicts reimplemented to give them more conventional/consistent
dictionary behavior. Also have added functionality to support
(limited) non-Gaussian distributions. Better documentation for
BufferDicts.

- Internal data type ExtendedDict is now gone because BufferDict can
provide the needed functionality in a much more robust (and simple)
fashion.