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

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Make the unl migration tool support sites that use TemplateBeginEditable instead of InstanceBeginEditable.

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The unl migration tool will now ignore pages/files if they are duplicates of pages/files it has already seen.

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Re-enable the ability to use the "Add User" link so that we can manually add users with the privacy flag set.

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Remove the ability to administer settings in shared tables (mainly text formats) unless the user is an admin on the default site.

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On sub-sites, automatically give users the admin role if they have it on the default site and prevent anyone from removing it.

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Add the "Grant All Permissions" permission with works with the "Administer permissions" permission to allow/disallow users from being able to grant permissions that they themselves don't have.

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Update the migration tool so that it is possible to run a migration over multiple passes.  This could be useful if deployed on a server where there is a request timeout (ie: varnish on unlcms.unl.edu used to timeout a request after 60 seconds, but has since been increased to 600 seconds).

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Modified site creation tool to use new method: add records to .htaccess. 
THE CHANGES TO .htaccess.sample MUST BE COPIED TO YOUR .HTACCESS FILE!

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Add a small amount of protection to prevent symlinks from being removed by the site creation tool when a site is removed if it had sub-sites.

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Update to site creation tool to hopefully make drupal sites more portable between installations. Part 2.

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Second, the CAS module will always use SSL when validating a user's ticket.
Third, if a user has any roles other than Anonymous or Authenticated User, they will be given SSL links while "mortal" users will use plain http.

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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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Add a list of sites already created to the site creation tool.

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