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/strings/dec2bin.m	Mon Feb 23 16:42:25 2015 +0000
+++ b/scripts/strings/dec2bin.m	Mon Feb 23 14:54:39 2015 -0800
@@ -57,7 +57,7 @@
 %!assert (dec2bin (14, 6), "001110")
 %!assert (dec2bin ({1, 2; 3, 4}), ["001"; "011"; "010"; "100"])
 
-%%Test input validation
+## Test input validation
 %!error dec2bin ()
 %!error dec2bin (1, 2, 3)