Allow ctime (and friends) to notice when the timezone
link (/etc/localtime) has been changed.
This is useful when long running processes (e.g. in appliances)
are puting out data with times while the adminstrator changes thes
timezone of the machine. The alternative is to restart every daemon
on the machine that uses this service. In our appliance we default
to noticing but I plan to commit it with a default of "same
behaviour as prior". An environent variable can be set while running
a program t make it notice changes (or not).
If not set the default applies.
Documentationchanges will follow