Python-xz

* Allow building without manpage
* Allow building against musl
* Fix memory corruption error
* Fix decompressing large files on 32-bit systems
* Avoid unaligned memory access
* Fix warnings with recent compilers
* Use optimized endian swapping functions on macOS

* fixes large file support for listing

* add htole64 and le64toh on glibc < 2.9

* include man page in release tarball

* complete autotools build, see README.md for build instructions
* large-file support for 32-bit systems
* creates output file with permissions of input file (if possible, i.e. not
reading from stdin)
* better error messages on incorrect input path
* list main differences between pixz and xz in README
* fix issue with extreme (-e) command line option parsing
* adds keep input (-k) command line option

* Fix a crashing bug when input is incompressible
https://github.com/vasi/pixz/issues/10