Add xz plugin.
tree9817362c865e9c1752f006ebd04893b5aec751a4
-rw-r--r-- 304 .gitignore
-rw-r--r-- 1448 LICENSE
-rw-r--r-- 1639 Makefile.am
-rw-r--r-- 1120 README
-rw-r--r-- 742 TODO
-rw-r--r-- 5881 configure.ac
drwxr-xr-x - docs
drwxr-xr-x - include
drwxr-xr-x - m4
drwxr-xr-x - plugins
drwxr-xr-x - src