FIXPSLINESTYLE: Fix line styles in exported post script files

FIXPSLINESTYLE(FILENAME) fixes the line styles in the postscript file FILENAME. The file will be over-written. This takes a .PS or .EPS file and fixes the dotted and dashed line styles to be a little bit more esthetically pleasing. It fixes the four default line styles (line, dotted, dashed, dashdot).

FIXPSLINESTYLE(FILENAME, NEWFILENAME) creates a new file NEWFILENAME.

This is meant to be used with postscript files created by MATLAB (print, export).
Example:
x = 1:.1:10;
y1 = sin(x);
y2 = cos(x);
h = plot(x, y1, '--', x, y2, '-.');
set(h, 'LineWidth', 2);
grid on;
legend('line 1', 'line2');

print -depsc test.eps
fixPSlinestyle('test.eps','fixed_test.eps');