Issue 402 Pull Request

Issue 396 Pull Request

If an alias has an installed id of 6, which means it is going to replace the current
default path, disable the checkbox as a safeguard to prevent any weird stuff when cron runs.

Prevent alias paths from being parent or sub directories of the current path.

For example, if you have a site x/y and you create an alias to it: 'x',
then that new alias  works but now the default path x/y returns a 404

Create a new alias with (new) status code 6. Then when cron runs switch the new alias and the default site path.

Also includes a bunch of cleanup (using vars properly in t(), removing unnecessary fieldsets, etc)