Fix Linux build.

Imported from Snowglobe.

Imported from Snowglobe.

Probably a regression from the prevalidator rework - was enforcing non-negative int when precision=0 (i.e. non-float), should have been enforcing only full int range.

Fix double definition of create_jump_keys="true" introduced in the fix for VWR-20724 to pass coding policy check.

I couldn't reproduce the problem (it has happened for only two users, both running MacOSX),
but from what I see in the logs, it might have been caused by (or related to) NULL COF items.
I haven't found out how they appear nor what exactly causes the crash, but just for any
case I added a check to make sure we don't try to update wearables ordering info for such items.

Reviewed by Sergey Litovchuk at https://codereview.productengine.com/secondlife/r/876/

--HG--
branch : product-engine

--HG--
branch : product-engine

re-merge viewer-public.  has a rough edge or two, but this is closer to the snowglobe2.1 and viewer2.2 code, and beats people re-applying their viewer-public changes piecemeal while waiting for this to land.

As advertized, I have removed the short-term hack that I put in place
to make release note URLs work. I have now put in place a more general
and correct solution. The key observeration from Roxie is that SLE
SLurls should have the same hostname as the grid host. So now, URLs
like http://google.com/app are no longer categorized as a SLurl and
produce errors when you click on them.