mysite 5.x-2.17

Fixes a bug in the 5.x.2.16 release that was caused when refactoring the plugin load sequence.

Adds a "source content" overview link when creating Droplets, so that you can see the Block or View that was used.

Additional notes from the CHANGELOG:

-- #210510. Partial change to droplet.inc for killes, to show the originating block or view data.
We need to make this a link to the original.
-- #208887 by atuyo60. Incorrect use of t() in theme_mysite_submenu() causes
errors for non-English translations.
-- The following bugs are all related to changes in mysite_get_includes() and improper
use of static variables.
-- #208895 by atuyo60
-- #208276 by relkiman
-- #208610 by LouBabe
-- Fixes mysite_load_includes() to throw a warning when no includes are active.
-- Fixes an issue where content pages for disabled includes could still be loaded.

Thanks to everyone listed above, and sorry for the buggy 5.x.2.16 release.