Enhancement: Add count of found errors for plugin UI

[mikedin]

Plugin Check (PCP) plugin
Version 1.7.0

After plugin check in wp-admin I've get only common:

Checks complete. Errors were found.
(and list of errors, of course)

But I didn't see summary: count of errors for all files. Why?

[davidperezgar]

There is no reason. We didn't pay attention to the numbers, but I can see that it's helpful. You could contribute to that!