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/sparse/cgs.m	Mon Feb 23 16:42:25 2015 +0000
+++ b/scripts/sparse/cgs.m	Mon Feb 23 14:54:39 2015 -0800
@@ -159,7 +159,7 @@
         ## We reach tolerance tol within maxit iterations.
         flag = 0;
         break
-      elseif (resvec (end) == resvec (end - 1))
+      elseif (resvec(end) == resvec(end - 1))
         ## The method stagnates.
         flag = 3;
         break