Replace use of `shutil.copytree` with `copy_tree` and `install_tree` functions in `llnl.util.filesystem`.
- `copy_tree` copies without setting permissions. It should be used to copy files around in the build directory.
- `install_tree` copies files and sets permissions. It should be used to copy files into the installation directory.
- `install` and `copy` are analogous single-file functions.
- add more extensive tests for these functions
- update packages to use these functions.
* New package: qbox
* API changes
* Use install instead of shutil for comd
* Use any BLAS library
* Fix typo
* Python2 fix
* python2 + fix backslashes
* Modified to respond to ld_flags correctly
* Modified to use ld_flags
* Add ld_flags support
