Hook into Update Status report to list special upgrade instructions

Create a custom module that will display special upgrade instructions right on the Update Status report page. This custom module can have a directory of includes for each module with custom instructions.

Some modules have libraries (RDF, WYSIWYG) that would be wiped during a typical upgrade. Some projects require patching a module. Sometimes a module is purposely left not-upgraded because the upgrade causes bugs (either due to dependency on custom code, or because the upgrade path is broken).

These instructions would then make it obvious to the module updater that this upgrade path will require special care.