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/specfun/factor.m	Mon Feb 23 16:42:25 2015 +0000
+++ b/scripts/specfun/factor.m	Mon Feb 23 14:54:39 2015 -0800
@@ -107,7 +107,7 @@
 %!   assert (all ([0,pf] != [pf,0]));
 %! endfor
 
-%% Test input validation
+## Test input validation
 %!error factor ()
 %!error factor (1,2)
 %!error <Q must be a real integer> factor (6i)