Use reaction.kinetics instead of entry.data when evaluating kinetics.

The former is filled in by getForwardReactionForFamilyEntry(), and is
always in the forward direction of the reaction family. The latter might
be in the reverse direction, since that is something we allow in the
training and test sets.
Minor bugfix to convertKineticsToPerSiteBasis().

Now uses value_si instead of value(s), in keeping with the ScalarQuantity
and ArrayQuantity objects.
Some prettifying of the graphs produced when evaluating kinetics.

In an effort to produce publication-quality plots.
Can now control plotting of exact or estimate kinetics during evaluation.

The --exact and --estimate command-line arguments control whether only
exact or only estimated rates are plotted. You should use one, the other,
or neither of these arguments. The file name of the saved plots now
contains this information as well.
Fixed entry #47 in NIST R_Recombination depository.

Seems to have been incorrectly transcribed by the NIST folks; I got these
values from the original paper.
Removed some non-high-P kinetics from the R_Recombination NIST depository.

The source paper (2004LI/KAZ7671-7680:12) gave the kinetics for this
reaction at several pressures, and the NIST folks transcribed each of
these as separate entries instead of as a single PDepArrhenius entry.
I've kept only the one for the high-pressure limit.
Fixed a few other values in the R_Recombination NIST depository.

Again, these seem to be transcription errors when input into the NIST
kinetics database. Updated values come from the original sources.
Honor temperature range when plotting evaluated kinetics.

It's not a fair evaluation if the k(T) from the literature is outside the
valid temperature range. This does reduce the number of plotted points
somewhat, as many experimental measurements are only valid over a small
temperature range.
Fixed sign errors in H_Abstraction NIST entries #600 and #601.

Based on the source paper, I can see where someone would get confused as
to the sign of the Ea values.
Updated entries #458 and #459 in R_Addition_MultipleBond NIST depository.

Someone had used the k(T,P) values at 1 bar from the paper instead of
the k(T,P -> infinity) values listed just a few lines below it in the
same table in the source paper.
Fixed A factor error for two entries in R_Addition_MultipleBond NIST.

These A factors were off by an Avogadro number (and this despite having
units of s^-1).
Removed several entries from R_Addition_MultipleBond NIST depository.

These entries did not contain high-pressure-limit Arrhenius parameters,
but instead k(T,P) values for 1 bar.