maint: Capitalize variable names appearing in error() messages of m-files. * scripts/audio/@audioplayer/get.m, scripts/audio/@audiorecorder/get.m, interp1.m, narginchk.m, nargoutchk.m, randi.m, __fltk_file_filter__.m, imshow.m, rgbplot.m, javachk.m, usejava.m, condest.m, unpack.m, pqpnonneg.m, savepath.m, default_prefix.m, get_forge_download.m, get_forge_pkg.m, installed_packages.m, annotation.m, daspect.m, pbaspect.m, isocaps.m, pan.m, printd.m, __gnuplot_draw_axes__.m, rotate.m, rotate3d.m, zoom.m, splinefit.m, addpref.m, getpref.m, rmpref.m, eigs.m, normrnd.m, t_test_regression.m: Capitalize variable names appearing in error() messages.

--- a/scripts/general/randi.m	Thu Oct 27 09:24:58 2016 +0200
+++ b/scripts/general/randi.m	Mon Nov 14 12:12:02 2016 -0800
@@ -105,7 +105,7 @@
       maxval = double (flintmax (rclass));
       minval = -maxval;
     else
-      error ("randi: unknown requested output class '%s'", rclass);
+      error ("randi: unknown requested output CLASS '%s'", rclass);
     endif
     if (imax > maxval)
       warning (["randi: integer IMAX exceeds requested type.  ", ...