added new options to implement different curves for conductance - psi(LWP)
changed leaf conductance curve implementation
changed defaults for non-standard stratum lwp-conductance curves
Update construct_stratum_defaults.c

fixed typo in new parameter curve name
fixed bug in use of new LWP-conductance curves
Added a moisture (through epv.psi - or stratum water potential) as one of the controls on phenology,
two new stratum default parameters are added
epc.gs_psi_min  (default value -15)
epc.gs_psi_max  (defaul value -14)
These default values essentially turn off this control on leaf on/off (since rootzone psi is almost
always greater than -14 so the other controls (daylength, temperature, vpd) will dominate
To use change these values to reflect the soil moisture that should control leaf on/off
Added a running average of PET and ET for use by the firespread model
Merge branch 'newstrata' into develop = using add_headers and output_patch from develop

Conflicts:
	rhessys/output/add_headers.c
	rhessys/output/output_patch.c