preamble: sometimes need package morewrites

Author: wiobber

preamble.tex

@@ -13,6 +13,8 @@
     {./PROB_linTrans}
     }
 
+
+\usepackage{morewrites}
 \usepackage{tikz}
 \usepackage{tkz-euclide}
 \usepackage{tikz-3dplot}