port spell fixes to source code

src/KSPACE/pppm_disp.h

@@ -489,7 +489,7 @@ Self-explanatory.
 
 E: KSpace accuracy too large to estimate G vector
 
-Reduce the accuracy request or specify gwald explicitly
+Reduce the accuracy request or specify gewald explicitly
 via the kspace_modify command.
 
 E: Could not compute grid size for Coulomb interaction

src/input.cpp

@@ -429,14 +429,14 @@ char *Input::nextword(char *str, char **next)
     start += 3;
     *next = stop+3;
     if (**next && !isspace(**next))
-      error->all(FLERR,"Input line quote not followed by whitespace");
+      error->all(FLERR,"Input line quote not followed by white-space");
   } else if (*start == '"' || *start == '\'') {
     stop = strchr(&start[1],*start);
     if (!stop) error->all(FLERR,"Unbalanced quotes in input line");
     start++;
     *next = stop+1;
     if (**next && !isspace(**next))
-      error->all(FLERR,"Input line quote not followed by whitespace");
+      error->all(FLERR,"Input line quote not followed by white-space");
   } else {
     stop = &start[strcspn(start," \t\n\v\f\r")];
     if (*stop == '\0') *next = stop;

src/input.h

@@ -173,9 +173,9 @@ E: Unbalanced quotes in input line
 No matching end double quote was found following a leading double
 quote.
 
-E: Input line quote not followed by whitespace
+E: Input line quote not followed by white-space
 
-An end quote must be followed by whitespace.
+An end quote must be followed by white-space.
 
 E: Invalid variable name
 

src/lammps.h

@@ -170,7 +170,7 @@ The size of the MPI datatype does not match the size of a bigint.
 
 E: Small to big integers are not sized correctly
 
-This error occurs whenthe sizes of smallint, imageint, tagint, bigint,
+This error occurs when the sizes of smallint, imageint, tagint, bigint,
 as defined in src/lmptype.h are not what is expected.  Contact
 the developers if this occurs.