* update flux dependencies and package
* refinements from @adamjstewart
* fix flux document generation
The docbook-xsl package has been added, and correctly configures catalog
files to generate documentation correctly with asciidoc.
Package repositories now look like this:
top-level-dir/
repo.yaml
packages/
libelf/
package.py
mpich/
package.py
...
This leaves room at the top level for additional metadata, source,
per-repo configs, indexes, etc., and it makes it easy to see that
something is a spack repo (just look for repo.yaml and packages).
