Updates to the unl migration tool, including a UI change and the addition of the ability to manage site aliases.

git-svn-id: file:///tmp/wdn_thm_drupal/trunk@283 20a16fea-79d4-4915-8869-1ea9d5ebf173

Bring unl_schema() up to date with latest unl_sites table changes so that a fresh drupal install will work; Fix unl_update_ functions by removing multiple adds of clean_url column which causes update to fail

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git-svn-id: file:///tmp/wdn_thm_drupal/branches/drupal-7.x@208 20a16fea-79d4-4915-8869-1ea9d5ebf173

git-svn-id: file:///tmp/wdn_thm_drupal/branches/drupal-7.x@202 20a16fea-79d4-4915-8869-1ea9d5ebf173

git-svn-id: file:///tmp/wdn_thm_drupal/branches/drupal-7.x@176 20a16fea-79d4-4915-8869-1ea9d5ebf173

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