BlackmanHarris4 fourth coefficient was ignored.

I was plotting the frequency transfer functions of the Sinc windows
and the result for BlackmanHarris4 looked wrong.  I checked the code,
and the 4th coefficient for the window was being ignored.

Change-Id: I27c7eacd4a5cb5659d95755f1229f573a1798f82
Default parameter for Kaiser window is wrong.

I was previously setting the Kaiser window's alpha parameter to 3*n
where n is the window radius (the default radius is 3).  This was
wrong, the paper that I based this on was using a different Kaiser
parameter that was actually "pi*alpha".  The correct action is to
set the alpha parameter to n.

Change-Id: I4486d8caa4356b491949c7ed0d1ef0519df26b54
Fix copy-paste parameter name.

Change-Id: I598aa225679141421a5fe6cfec7724eec3ebf2ea
Merge topic 'interpolation-fixes' into master

d0805852 Fix copy-paste parameter name.
904b415e Default parameter for Kaiser window is wrong.
00f6ec42 BlackmanHarris4 fourth coefficient was ignored.