Fix typo.

ChangeLog

@@ -5,7 +5,7 @@
 
 2017-05-26  Uwe Schulzweida
 
-	* eca_gsl: set default to northern himisphere
+	* eca_gsl: set default to northern hemisphere
 
 2017-05-23  Uwe Schulzweida
 

doc/tex/mod/EcaGsl

@@ -14,7 +14,7 @@ Within a period of 12 months, the thermal growing season length is officially de
 @Item = first occurrence of at least nday consecutive days with TG > @math{T}
 @Item = first occurrence of at least nday consecutive days with TG < @math{T} within the last 6 months
 @EndItemize
-On northern hemispere, this period corresponds with the regular year, whereas on southern hemispere, it starts 
+On northern hemisphere, this period corresponds with the regular year, whereas on southern hemisphere, it starts 
 at July 1st. Please note, that this definition may lead to weird results concerning values TG = @math{T}: 
 In the first half of the period, these days do not contribute to the gsl, but they do within the second half.
 Moreover this definition could lead to discontinuous values in equatorial regions.

src/ecacore.cc

@@ -1087,7 +1087,7 @@ void eca4(const ECA_REQUEST_4 *request)
     }
   else
     {
-      for ( int i = 0; i < gridsize; ++i ) yvals[i] = 20; // Northern himisphere
+      for ( int i = 0; i < gridsize; ++i ) yvals[i] = 20; // Northern hemisphere
     }
 
   /* Two fields are needed because of the definition of gsl for northern and