* deprecate normalize and mustnormalize
Signed-off-by: Chris O'Haver <cohaver@infoblox.com>

* add runtime warning
Signed-off-by: Chris O'Haver <cohaver@infoblox.com>

* elaborate runtime warning
Signed-off-by: Chris O'Haver <cohaver@infoblox.com>

* include caller info
Signed-off-by: Chris O'Haver <cohaver@infoblox.com>