More robust file traversal logic

File traversal can now cope with symbolic links. The original path to
each file is preserved where before they were unintentionally
canonicalized, so the source folder prefix can now be correctly
stripped from the path of each source file.

This commit also adds the !folder syntax from the original toaster.
Directories with a !-prefix are copied without modification to the site
root.

A --delete option has been added to the program. When this option is
set, the destination directory is first deleted if it already exists.

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