Turn debugging info on. GNU LilyPond reads the file file(.dstreamrc),
which lists what functions and classes may produce copious debugging
output.
+dit(-s,--safe)
+ Disallow untrusted code(\include) directives, backslashes in TeX()
+code and named output.
dit(-t,--test)
Switch on any experimental features. Not for general public use.
dit(-w,--warranty)