Added cmake option to enable/disable RTTI.
Workaround cmake bug where some platforms don't set NDEBUG for RelWithDebInfo
Eliminate random() from the spec; never implemented, not missed.

Augment description of hash() to allow it to hash integers and strings.
Add make and CMake options USE_EXTERNAL_PUGIXML to use external/system
PugiXML rather than the one from the OIIO distribution.  This is especially
helpful for sites that build OIIO with its USE_EXTERNAL_PUGIXML mode.
Fix missing integer min, max, and clamp declarations
CHANGES, rebuild docs, bump version for 1.3.1