Improve Drupal Multi-site in subdirectories support

[mkochendorfer]

There are 2 ways to support multisite in subdirectories in Drupal:

1. Symlinks
2. Web server aliases

https://www.drupal.org/docs/7/multisite-drupal/multi-site-in-subdirectories

Right now the unison file system does not play nicely with the symlink approach to supporting multisite in subdirectories for Drupal, which seems to be the most common approach. The alias approach works just great with unison, but many hosting companies do not allow this type of web server config to be done.

We have worked around this issue by using web server config aliases for the local development in Outrigger with Unison, but then using symlinks on the servers. It would be great to improve the documentation and support for Drupal multisite in subdirectories.