Add xmlwalker support for adding users from apache htpasswd files
Fix xmlwalker handling of elements crawled from content
Resolve xmlwalker constructed content
Fix redirector update paths key handling
Recursively update parent directory paths using redirector
Redirector support for old path keys with one path
Redirector path handling fixes for empty paths (CSV source) and leading slashes
Add support for updating ElementTree element attributes in redirector
Fix redirector recursive path updating
Preserve redirector path leading slashes
Various xmlwalker config fixes:
* redirector path handling
* resolve context when possible
* refactor external link handling
* support HTML Files for URLs where content can't be found