* Do not call setup_package for fake installs
- setup package could fail if ``setup_dependent_environment`` or other
routines expected to use executables from dependencies
- xpetsc and boost try to get python config variables in
`setup_dependent_package`; this would cause them not to be
fake-installable
* Remove vestigial deptype_query argument to Spec.traverse()
- The `deptype_query` argument isn't used anymore -- it's only passed
around and causes confusion when calling traverse.
- Get rid of it and just keep the `deptypes` argument
* Don't print redundant messages when installing dependencies
- `do_install()` was originally depth-first recursive, and printed "<pkg>
already installed in ..." multiple times for packages as recursive
calls encountered them.
- For much cleaner output, use spec.traverse(order='post') to install
dependencies instead
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