update to spitfire 4 and medlyn stomatal model

Author: Jessica Needham

bld/namelist_files/namelist_defaults_ctsm.xml

@@ -2408,9 +2408,9 @@ lnd/clm2/surfdata_esmf/NEON/ctsm5.3.0/surfdata_1x1_NEON_TOOL_hist_2000_78pfts_c2
 <!-- ===== FATES DEFAULTS =========== -->
 <fates_electron_transport_model use_fates=".true.">FvCB1980</fates_electron_transport_model>
 <fates_photosynth_acclimation   use_fates=".true.">nonacclimating</fates_photosynth_acclimation>
-<fates_spitfire_mode            use_fates=".true.">0</fates_spitfire_mode>
+<fates_spitfire_mode            use_fates=".true.">4</fates_spitfire_mode>
 <fates_harvest_mode             use_fates=".true.">no_harvest</fates_harvest_mode>
-<fates_stomatal_model           use_fates=".true.">ballberry1987</fates_stomatal_model>
+<fates_stomatal_model           use_fates=".true.">medlyn2011</fates_stomatal_model>
 <fates_stomatal_assimilation    use_fates=".true.">net</fates_stomatal_assimilation>
 <fates_leafresp_model           use_fates=".true.">ryan1991</fates_leafresp_model>
 <fates_cstarvation_model        use_fates=".true.">linear</fates_cstarvation_model>