switch all <math.h> includes to <cmath> includes on an attempt to dodge some abiguous references to atan2()

bitmap2component/bitmap2component.cpp

@@ -21,7 +21,7 @@
  * or you may write to the Free Software Foundation, Inc.,
  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
  */
-#include <math.h>
+#include <cmath>
 
 // For some unknown reasons, polygon.hpp shoul be included first
 #include <boost/polygon/polygon.hpp>
@@ -30,7 +30,7 @@
 #include <string.h>
 #include <errno.h>
 #include <stdlib.h>
-#include <math.h>
+#include <cmath>
 #include <vector>
 
 #include <potracelib.h>