Component#isEnabled and Component#isEnableAllowed

[Matej Knopp]

We have two methods that determine whether component should be allowed. 
Do we always check both?

I mean, look at Link#onComponentTag, we only check
isEnabled. So even though enable is not allowed, we still render link as 
enabled. Is this right?

Shouldn't e.g. isEnabled() return false if the ENABLE action is not 
permitted?

-Matej