svn path=/main/trunk/; revision=2546
* Support for splitting out debug information into separate files in
/usr/lib{,32,64}.
* exec subsystem refactoring (now with less bugs!)
-* Added sha256 and rmd160 hashes for digests/checksums
+* Added sha256 and rmd160 hashes for digests/manifests
* Make --emptytree only apply to ${ROOT} rather than always including /.
* Allow packages to be upgraded that are only depended on via a
"|| ( =cat/pkg-1* =cat/pkg-2* )" construct.