secure TeX and its friends
--- a/manual/makefile
+++ b/manual/makefile
@@ -1,4 +1,4 @@
-LATEX=latex
+LATEX=latex -no-shell-escape
 TTH=../tth -a
 # If latex is not installed, try the following fall-back:
 #LATEX=echo
--- a/manual/split/makefile
+++ b/manual/split/makefile
@@ -1,4 +1,4 @@
-LATEX=latex
+LATEX=latex -no-shell-escape
 TTH=../../tth -a
 # If latex is not installed, try the following fall-back:
 #LATEX=echo