Soften messages for read-only extensionsDir
Improve messaging when someone has a different policy for managing
extensionsDir.This a continuation of this PR. Most of the messaging update has already been done. There is only one message ("Read-Only Extensions"). It still encourages web-writable policy, but it lowers the severity and presents it a choice ("if you want X, do Y").
Probably, changing the
warning into a
notice is the only thing to update:- a
warning implies something is wrong, while a
notice says it's merely out of the ordinary.