Minor crop source updates - Sept 2014 #1

[controller.cpp] crop output header names and alignment to left.
Replaced column for LA_ac with LA_dead for senescent leaf area

[development.cpp] Bug fix with transition to silking when
daylengthinsensitive flag is off.  Some housekeeping to tide things up.

[leaf.cpp] senescence function now respond to water stress and N stress
to accelerate to a scaled value.  LWPeffect now back to using published
parameter values by Yang et al. (2009)

[plant.cpp] physiological maturity is reached when less than 5% of total
leaf area is green. Carbon allocation to root after tassel initiation
and before grain fill is reduced to the half of demand from the root
part determined in 2dsoil (need further testing). Q10 value for
respiration is changed back to 2.0.

Additional changes:
.var, .ini, and .dat files changed for new data input structure that
includes CO2 as a global variable (Sept 10 changes)