* Re-introduced *examples/null.c*.
* Added experimental support for building with Meson.
* Document that `-o auto_unmount` implies `-o nodev,nosuid`.
* Document that the *use_ino* option of the high-level interface does
not affect the inode that libfuse and the kernel use internally.
* Fixed test cases for passthrough* examples (they weren't actually
testing the examples).
* Fixed several bugs in the passthrough* examples.