Remove trailing whitespace from most CMake and C/C++ code

Our Git commit hooks disallow modification or addition of lines with
trailing whitespace.  Wipe out all remnants of trailing whitespace
everywhere except third-party code.

Run the following shell code:

git ls-files -z -- \
 bootstrap doxygen.config '*.readme' \
 '*.c' '*.cmake' '*.cpp' '*.cxx' \
 '*.el' '*.f' '*.f90' '*.h' '*.in' '*.in.l' '*.java' \
 '*.mm' '*.pike' '*.py' '*.txt' '*.vim' |
egrep -z -v '^(Utilities/cm|Source/(kwsys|CursesDialog/form)/)' |
egrep -z -v '^(Modules/CPack\..*\.in)' |
xargs -0 sed -i 's/ \+$//'

Tests/Tutorial/Step7/MathFunctions/CMakeLists.txt

@@ -12,7 +12,7 @@ add_custom_command (
   )
 
 set_source_files_properties (
-  mysqrt.cxx PROPERTIES 
+  mysqrt.cxx PROPERTIES
   OBJECT_DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/Table.h
   )
 

Tests/Tutorial/Step7/MathFunctions/MakeTable.cxx

@@ -1,4 +1,4 @@
-// A simple program that builds a sqrt table 
+// A simple program that builds a sqrt table
 #include <stdio.h>
 #include <math.h>
 
@@ -12,14 +12,14 @@ int main (int argc, char *argv[])
     {
     return 1;
     }
-  
+
   // open the output file
   FILE *fout = fopen(argv[1],"w");
   if (!fout)
     {
     return 1;
     }
-  
+
   // create a source file with a table of square roots
   fprintf(fout,"double sqrtTable[] = {\n");
   for (i = 0; i < 10; ++i)

Tests/Tutorial/Step7/MathFunctions/mysqrt.cxx

@@ -14,11 +14,11 @@ double mysqrt(double x)
     {
     return 0;
     }
-  
+
   double result;
 
   // if we have both log and exp then use them
-  double delta;  
+  double delta;
 
   // use the table to help find an initial value
   result = x;