Remove temporary_SF_switch

Remove temporary_SF_switch. Spitfire is runtime configurable via name
list and is now off by default. This switch was only used to disable
spitfire at compile time.

Fixes: 140

User interface changes?: spitfire configured at runtime instead of
compile time.

Code review: self

Test suite: SMS_D_Mmpi-serial_Ld5.5x5_amazon.ICLM45ED.yellowstone_intel.clm-edTest
Test baseline: 2ac7960
Test namelist changes: none
Test answer changes: bit for bit
Test summary: pass

components/clm/src/ED/fire/SFMainMod.F90

@@ -52,11 +52,8 @@ subroutine fire_model( currentSite, atm2lnd_inst, temperature_inst)
 
     type (ed_patch_type), pointer :: currentPatch
 
-    integer temporary_SF_switch
-
     !zero fire things
     currentPatch => currentSite%youngest_patch
-    temporary_SF_switch = 1
     do while(associated(currentPatch))
        currentPatch%frac_burnt = 0.0_r8
        currentPatch%AB         = 0.0_r8
@@ -68,7 +65,7 @@ subroutine fire_model( currentSite, atm2lnd_inst, temperature_inst)
        write(iulog,*) 'use_ed_spit_fire',use_ed_spit_fire
     endif
 
-    if(use_ed_spit_fire.and.temporary_SF_switch==1)then
+    if(use_ed_spit_fire)then
        call fire_danger_index(currentSite, temperature_inst, atm2lnd_inst)
        call wind_effect(currentSite, atm2lnd_inst)
        call charecteristics_of_fuel(currentSite)