* input/no-notation/safe-include.ly:

* input/no-notation/safe-include.ly:
* input/no-notation/safe-guile.ly:
* input/no-notation/safe-ps.ly:
* input/no-notation/safe-tex.ly: New file.

* scripts/lilypond.py (global_latex_preamble): Add \nofiles for
safe mode Add -s,--safe-mode option.  Use -S,--set for setting
options now.
(run_lilypond): When in --safe-mode, pass option to lilypond-bin.
When in --safe-mode, set environment openout_any=p[aranoid].

* tex/ltest.tex:
* tex/lilyponddefs.tex: Add \nofiles.

* Documentation/topdocs/NEWS.texi: Add note about safe mode.