[G12] Lambda diff x-sec

[Johann Goetz]

I posted to the wiki the Lambda diff x-sec from g12 (red points) with a
comparison to g11a (yellow bands). Units are micro-barns on the y-axes, and
center-of-mass cos(theta) of the Lambda on the individual x-axes. The
running axis on the top of each row is sqrt(s) in GeV. I'll clean up the
figure, but I'm not completely sold on the error bars - especially when the
cross section is close to zero. They may be OK though.

Links to the plots (linear and log scales respectively):

linear plot
<https://clasweb.jlab.org/rungroups/g12/wiki/images/8/87/Goetz_2015.04.21_lambda_dcs_linear.pdf>

log plot
<https://clasweb.jlab.org/rungroups/g12/wiki/images/b/b2/Goetz_2015.04.21_lambda_dcs_log.pdf>

Notes about these plots: tagger was populated by data using gpp during
simulation, start counter timing cuts were different for data than for
simulation but set to the same number of sigma on the (Gaussian) signal of
Lambdas. Trigger modeling was applied (3-prong and 2-prog+MORA/B). Lambdas
and kaons were allowed to decay using gsim so no branching ratio was needed
in the final result (only the target and unit conversion terms).

Overall, pretty good agreement with g11. I'll put this into the g12
analysis note once I get a title and readable axis labels.
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