Linux compat, ading missing includes

src/ITAMagnitudeSpectrum.cpp

@@ -2,6 +2,7 @@
 #include <ITAConstants.h>
 
 #include <numeric>
+#include <limits>
 
 CITAMagnitudeSpectrum::CITAMagnitudeSpectrum( const int nNumBands )
 	: CITASpectrum( nNumBands )

src/ITASpectrum.cpp

 #include <ITASpectrum.h>
 #include <ITAException.h>
+#include <cmath>
 
 CITASpectrum::CITASpectrum( const int nNumBands )
 {
@@ -151,4 +152,4 @@ std::ostream& operator<<( std::ostream& os, const CITASpectrum& oSpectrum )
 	}
 
 	return os;
-}
\ No newline at end of file
+}