maint: Clean up m-files to follow Octave coding conventions. Try to trim long lines to < 80 chars. Use '##' for single line comments. Use '(...)' around tests for if/elseif/switch/while. Abut cell indexing operator '{' next to variable. Abut array indexing operator '(' next to variable. Use space between negation operator '!' and following expression. Use two newlines between endfunction and start of %!test or %!demo code. Remove unnecessary parens grouping between short-circuit operators. Remove stray extra spaces (typos) between variables and assignment operators. Remove stray extra spaces from ends of lines.

--- a/scripts/statistics/base/zscore.m	Mon Feb 23 16:42:25 2015 +0000
+++ b/scripts/statistics/base/zscore.m	Mon Feb 23 14:54:39 2015 -0800
@@ -95,7 +95,7 @@
 %!assert (zscore (ones (3,2,2,2)), zeros (3,2,2,2))
 %!assert (zscore ([2,0,-2;0,2,0;-2,-2,2]), [1,0,-1;0,1,0;-1,-1,1])
 
-%% Test input validation
+## Test input validation
 %!error zscore ()
 %!error zscore (1, 2, 3)
 %!error zscore (['A'; 'B'])