maint: Use parentheses around condition for switch(),while(),if() statements. * libinterp/corefcn/dirfns.cc, libinterp/octave-value/ov-fcn-handle.cc, liboctave/array/Sparse.cc, scripts/image/rgb2ind.m, scripts/io/importdata.m, scripts/io/strread.m, scripts/optimization/fminbnd.m, scripts/optimization/sqp.m, scripts/plot/graphics_toolkit.m, scripts/plot/hdl2struct.m, scripts/plot/legend.m, scripts/plot/print.m, scripts/plot/printd.m, scripts/plot/private/__contour__.m, scripts/plot/private/__go_draw_axes__.m, scripts/plot/struct2hdl.m, scripts/polynomial/polyeig.m, scripts/sparse/bicg.m, scripts/specfun/ellipke.m, scripts/special-matrix/gallery.m, scripts/ui/errordlg.m, scripts/ui/helpdlg.m, scripts/ui/inputdlg.m, scripts/ui/listdlg.m, scripts/ui/questdlg.m, scripts/ui/warndlg.m: Use parentheses around condition for switch(),while(),if() statements.

--- a/scripts/optimization/fminbnd.m	Tue Jul 09 12:22:33 2013 -0700
+++ b/scripts/optimization/fminbnd.m	Tue Jul 09 14:04:05 2013 -0700
@@ -210,7 +210,7 @@
   iter(1).procedure = "initial";
 
   ## Handle the "Display" option
-  switch displ
+  switch (displ)
     case "iter"
       print_formatted_table (iter);
       print_exit_msg (info, struct("TolX", tolx, "fx", fval));
@@ -259,7 +259,7 @@
 ## Print either a success termination message or bad news
 function print_exit_msg (info, opt=struct())
   printf ("");
-  switch info
+  switch (info)
     case 1
       printf ("Optimization terminated:\n");
       printf (" the current x satisfies the termination criteria using OPTIONS.TolX of %e\n", opt.TolX);