Fixed #858 (+ line continuation after blanks in Spice reader)

testdata/algo/nreader14.cir

@@ -0,0 +1,3 @@
+
+.include "nreader14a.cir"
+

testdata/algo/nreader14a.cir

@@ -0,0 +1,4 @@
+.subckt INVX1 1 2 3 4 5 6
+  .include nreader14x.cir
+.ends 
+

testdata/algo/nreader14x.cir

@@ -0,0 +1,4 @@
+m$1 1 5 2 4 mlvpmos w=1.5um l=0.25um 
+m$2 3 5 2 6 mlvnmos w=0.95um l=0.25um
+m1 1  *an error
+

testdata/algo/nreader15.cir

@@ -0,0 +1,18 @@
+.SUBCKT SUBCKT 
+  + \$1 A[5]<1> V42\x28\x25\x29 Z gnd gnd$1
+* device instance $1 r0 *1 0,0 HVPMOS
+XD_$1 V42\x28\x25\x29 \$3 Z \$1 
+       + HVPMOS PARAMS: L=0.2 W=1 AS=0.18 AD=0.18
+       + PS=2.16 PD=2.16
+XD_$2 
+  + V42\x28\x25\x29 A[5]<1> \$3 \$1 
+  + HVPMOS PARAMS: L=0.2 W=1 AS=0.18 AD=0.18
+	+ PS=2.16 PD=2.16
+XD_$3 gnd \$3 gnd gnd$1 HVNMOS PARAMS: L=1.13 W=2.12 PS=6 PD=6 AS=0 AD=0
+  +
+
+XD_$4 gnd \$3 Z gnd$1 HVNMOS PARAMS: L=0.4 W=0.4 PS=1.16 PD=1.16 AS=0.19 AD=0.19
+XD_$5 gnd A[5]<1> \$3 gnd$1 HVNMOS 
+ + PARAMS: L=0.4 W=0.4 PS=1.76 PD=1.76 AS=0.19 AD=0.19
+
+.ENDS SUBCKT