* Support hardlinks/junctions on Windows systems without developer
mode enabled
* Generally, use of llnl.util.symlink.symlink is preferred over
os.symlink since it handles this automatically
* Generally an error is now reported if a user attempts to create a
symlink to a file that does not exist (this was previously allowed
on Linux/Mac).
* One exception to this: when Spack installs files from the source
into their final prefix, dangling symlinks are allowed (on
Linux/Mac - Windows does not allow this in any circumstance).
The intent behind this is to avoid generating failures for
installations on Linux/Mac that were succeeding before.
* Because Windows is strict about forbidding dangling symlinks,
`traverse_tree` has been updated to skip creating symlinks if they
would point to a file that is ignored. This check is not
transitive (i.e., a symlink to a symlink to an ignored file would
not be caught appropriately)
* Relocate function: resolve_link_target_relative_to_the_link
(this is not otherwise modified)
Co-authored-by: jamessmillie <smillie@txcorp.com>
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