New appID format

Problem/Motivation

This issue has been reported by Ugo Stephant of the Poool team.

In the poool.module file, appID is checked with a regex on the old appID format. The new one is a unique alphanumeric string of 64 characters. Both are valids, but here is the regex for the new one : /[A-Za-z0-9]{64}/

Proposed resolution

Keep both regex, add the new one.