Changeset 9705:bfac87aa5771
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stats: Fix some bugs in the python based stats system

This patch fixes assorted bugs in the python stats system. The following
bugs are addressed:

The text-based stats output now overwrites the output stats file if it
exists on the first stats dump. If it does not exist, it is
created. The file is appended to on subsequent stats dumps. This
mimics the operation of the C++ based stats system.

The total for a vector stat was not being calculated correctly as it
was calculating the sum of values including NaN and therefore any
vector which included a NaN summed to NaN. This operatino was not
desited as the old C++ based stats system ignored NaN values when
calculating the total.

The total function in info now checks to see if the stat is a scalar
or a vector, and returns the corresponding total.

Scalars and ScalarValues now have a length, mimicing the functionality
already found in Vector stats.

This patch also addresses a typo in the code for VectorDist, and a
typo in the definition of a Value.