ENH: noise models - added A, B, C, and D weightings to SPL

The SPL can now be weighted according to the new 'SPLweighting' entry
that can be set to:
- none: no weighting
- dBA : dB(A)
- dBB : dB(B)
- dBC : dB(C)
- dBD : dB(D)

This commit also includes code refactoring of the  noiseModel class to
remove the dependency on noiseFFT/declutter.

applications/utilities/postProcessing/noise/Make/options

@@ -1,7 +1,8 @@
 EXE_INC = \
     -I$(LIB_SRC)/surfMesh/lnInclude \
     -I$(LIB_SRC)/sampling/lnInclude \
-    -I$(LIB_SRC)/randomProcesses/lnInclude
+    -I$(LIB_SRC)/randomProcesses/lnInclude \
+    -I$(FFTW_INC_DIR)
 
 EXE_LIBS = \
     -lsampling \

applications/utilities/postProcessing/noise/noise.C

@@ -87,7 +87,6 @@ Usage
 
 
 See also
-    noiseFFT.H
     noiseModel.H
     windowModel.H