dc sweep fails after transient sim:

keep MODEDCTRANCURVE as provided by commit
7d8236766 ("b3ld.c, b4ld.c, b3v32ld.c: enable capacitance calculation during dc sweep", 2012-10-03)
Instead exclude current integration when MODEDCTRANCURVE is selected.
Unify setting ChargeComputationNeeded in b4vdld.c,
make it as in other b4xxld.c.

src/spicelib/devices/bsim3/b3ld.c

@@ -2812,6 +2812,10 @@ line755:
           if (!ChargeComputationNeeded)
               goto line850;
 
+          /* no integration, if dc sweep, but keep evaluating capacitances */
+          if (ckt->CKTmode & MODEDCTRANCURVE)
+              goto line850;
+
           if (ckt->CKTmode & MODEINITTRAN)
           {   *(ckt->CKTstate1 + here->BSIM3qb) =
                     *(ckt->CKTstate0 + here->BSIM3qb);

src/spicelib/devices/bsim3v32/b3v32ld.c

@@ -3125,6 +3125,10 @@ line755:
           if (!ChargeComputationNeeded)
               goto line850;
 
+          /* no integration, if dc sweep, but keep evaluating capacitances */
+          if (ckt->CKTmode & MODEDCTRANCURVE)
+              goto line850;
+
           if (ckt->CKTmode & MODEINITTRAN)
           {   *(ckt->CKTstate1 + here->BSIM3v32qb) =
                     *(ckt->CKTstate0 + here->BSIM3v32qb);

src/spicelib/devices/bsim4/b4ld.c

@@ -4614,6 +4614,10 @@ line755:
           if (!ChargeComputationNeeded)
               goto line850;
 
+          /* no integration, if dc sweep, but keep evaluating capacitances */
+          if (ckt->CKTmode & MODEDCTRANCURVE)
+              goto line850;
+
           if (ckt->CKTmode & MODEINITTRAN)
           {   *(ckt->CKTstate1 + here->BSIM4qb) =
                     *(ckt->CKTstate0 + here->BSIM4qb);

src/spicelib/devices/bsim4v5/b4v5ld.c

@@ -231,10 +231,9 @@ int ByPass, ChargeComputationNeeded, error, Check, Check1, Check2;
 
 ScalingFactor = 1.0e-9;
 ChargeComputationNeeded =  
-                 ((ckt->CKTmode & (MODEAC | MODETRAN | MODEINITSMSIG)) ||
+                 ((ckt->CKTmode & (MODEDCTRANCURVE | MODEAC | MODETRAN | MODEINITSMSIG)) ||
                  ((ckt->CKTmode & MODETRANOP) && (ckt->CKTmode & MODEUIC)))
                  ? 1 : 0;
-ChargeComputationNeeded = 1;
 
 #ifndef USE_OMP
 for (; model != NULL; model = BSIM4v5nextModel(model))
@@ -4188,6 +4187,10 @@ line755:
           if (!ChargeComputationNeeded)
               goto line850;
 
+          /* no integration, if dc sweep, but keep evaluating capacitances */
+          if (ckt->CKTmode & MODEDCTRANCURVE)
+              goto line850;
+
           if (ckt->CKTmode & MODEINITTRAN)
           {   *(ckt->CKTstate1 + here->BSIM4v5qb) =
                     *(ckt->CKTstate0 + here->BSIM4v5qb);

src/spicelib/devices/bsim4v7/b4v7ld.c

@@ -4523,6 +4523,10 @@ line755:
           if (!ChargeComputationNeeded)
               goto line850;
 
+          /* no integration, if dc sweep, but keep evaluating capacitances */
+          if (ckt->CKTmode & MODEDCTRANCURVE)
+              goto line850;
+
           if (ckt->CKTmode & MODEINITTRAN)
           {   *(ckt->CKTstate1 + here->BSIM4v7qb) =
                     *(ckt->CKTstate0 + here->BSIM4v7qb);