[600MRG] WSPR-X Noise blanker

[Eric NO3M]

An FYI to those that have noticed different decoding behaviour w/ WSPR-X 
vs. WSPR 2.xx.  I just received a note today from K1JT today that it was 
related to a software noise blanker implemented in WSPR 2.x that was not 
present in WSPR-X.  The recordings I sent were able to be decoded after 
he added the noise blanker to WSPR-X.

I see the noise blanker is added in the development code (SVN rev 3572), 
but not yet available in a ready to run package.

73 Eric NO3M/WG2XJM