[Audacity-nyquist] Patch improving Nyquist input behavior

[Al D. <bus...@gm...>]

Following this discussion on the audacity-nyquist list:

http://n2.nabble.com/Inputting-exact-values-into-Audacity-Nyquist-
effects-td3850278.html#a3850278

I've developed a patch improving the behavior of dialog boxes for 
Nyquist plugin inputs.  This solves the bug "P3: Nyquist 
implementation: Values appearing in effects text boxes are not always 
the hard-coded/previously entered values", and also makes it easier 
for users to enter values into the text boxes at higher precision than 
what's usually displayed (it used to be that they could not touch 
other sliders without having their custom values rounded to the 
nearest slider "tick").

 - Al