dw_beta | #306: error on subscriptions

As a free user, you should be able to have 25 subscriptions (meaning notifications when another user uploads an icon, or people comment on posts which aren't yours - things you're tracking; whatever you want to call it). However, users attempting to add up to 25 subscriptions receive an error stating that they've already hit their limit of 25 before the limit is actually reached.

ETA: this is a problem in user education, because the limit counts one for every inbox subscription and one for every email subscription and also the 'standard' subscriptions such as 'comments on my entries'. Bug is still open but has been moved to the Documentation team.