bogus otbBandMathXImageFilter test

Description

Running otbMathParserXTestDriver otbBandMathXImageFilter :

1188: The Following Parsed Expression  :  vcos(2 * pi * im1) div (2 * pi * bands(im2,{1,1,1}) + {3.38,3.38,3.38}) mult vsin(pi * bands(canal3,{1,1,1}))
1188: Generated 99 Underflow(s) And 98 Overflow(s) 

But test succeeds.

More tests

Changing muparserX formula to vcos(2 * pi * im1) div (2 * pi * bands(im2,{1,1,1}) + {10,20,30}) mult vsin(pi * bands(canal3,{1,1,1})) still have the under/overflow error.

Test still passes, without changing expected result computation in otbBandMathXImageFilter.cxx...

TODO: investigate this overflow error.