Blt_Tree(3) on Linux

The text c2a4fc00126b, as Debian 7 (Wheezy), Debian 6.0 (Squeeze), Debian 5.0 (Lenny), Debian 4.0 (Etch), Debian 3.1 (Sarge) shipped it.

Tree data object.

Blt_Tree(3) on Linux now