Add new comment

Thanks and receiving a few warnings

In the file wf_filtering.cpp we are getting a few warnings. Not sure if they are critical or not. This is using xcode 4.3 on the mac using the apple llvm 3.1 compiler. Below is the warning with the associated line numbers.

Control may reach end of non-void function
686

& has lower precedence than ==; == will be evaluated first
1169
1332
1623
1682
1703
1720
1759
1798
1857
1895
1934