EXP-1953: Altering the behavior of building an LLTextBase such that icons are appended in place rather than prepended out of context.

Pull and merge a single changeset from http://hg.lindenlab.com/nat/viewer-maint-1144/ to resolve build issues.

EXP-1953: Sending an automated IM back to the user who offered the teleport lure informing the inviter that the guest cannot access the region because of their maturity level.

Today, 2012-06-06, LLHTTPClient::get("http://www.google.com/") has stopped
working. This is unrelated to viewer code changes: it crosses repo boundaries.
Skip the afflicted tests to get builds working until we can recast the tests
to avoid the flaky dependency.

EXP-1942: BUGFIX Ensuring to clear the flag indicating that maturity changed during teleport when the maturity level change fails.

EXP-1942: Ensuring that the teleport cancel works in the case of restarting a teleport.  Also, ensuring to pull down the teleport screen if we time out of a maturity request with a pending teleport queued.

EXP-1950: Breaking out the dialogs into 2 paths so that teleports can report messages with slightly different wordings.

EXP-1942,EXP-1945: Pulling down the teleport screen in the scenario of waiting for a maturity preference change that is still being posted to the server.

EXP-1942,EXP-1945: Ensuring that the teleport process waits for the maturity preferences to be synced between viewer and server.

EXP-1942, EXP-1945: Improved handling of the maturity preference change response. Still needs work though.

EXP-1942,EXP-1945: Altering behavior when setting maturity preference to check the server response in an effort to ensure the viewer and server remain in sync.  This is a partial commit as I still need to add user behavior and notifications when things go wrong.

EXP-1948: Ensuring that we show the maturity changed notification in the case of a teleport failure on the second attempt.

Removing some code that allowed the viewer to toggle the user's maturity access level.  But only toggling it in the viewer leads to some really bad discontinuities with the server's actual access level for the user.

EXP-1944: Changing the default answer for the LandClaimAccessBlocked_Change and LandBuyAccessBlocked_Change notifications.

EXP1-1945: Adding in a flow to catch other cases of teleportation failures due to maturity levels and bad network access.  Still need better copy for the error message.

EXP-1941: Adding in debug setting to force enable purchase flow disregarding other checks including maturity.

EXP-1928: Restoring the flow for non-teleport-failure messages through the special notification handler.