Remove redundant re-initialization of variables

For many HRUs it takes noticeably long to reset hhsedy
while it is not used for ievent<3.

Other variables are also being initialized in other places.

Author: mlt

src/varinit.f

@@ -321,12 +321,13 @@ subroutine varinit
         wetsedo = 0.
         wetsep = 0.
 
+        if (ievent < 3) return
 	!! urban modeling by J.Jeong
-	  sedprev = 0.
-	  ubnrunoff = 0.
-	  irmmdt = 0.
+	!  sedprev = 0.          ! initialized in surfstor.f
+	!  ubnrunoff = 0.        ! reset in sim_initday.f
+	!  irmmdt = 0.           ! reset in surface.f
         hhsedy = 0.
-        ubntss = 0.
+        !ubntss = 0.             ! reset in sim_initday.f
 
        return
        end

src/zero_urbn.f

@@ -17,7 +17,7 @@ subroutine zero_urbn
       iabstr = 0.
 
 !!	subdaily sediment modeling by J.Jeong
-	hhsedy=0.
+!	hhsedy=0.               ! reset in varinit.f
 	spl_eros = 0.
 	rill_mult = 0.
 	eros_expo = 0.