Update to build on Xcode 6.0: TEMP fix to remove broken code (clang) until it's true purpose becomes clear

fixed copy behavior of recordings and accumulator buffers

improvements to predicate API
default rules encapsulated in LLInitParam
removed empty flag from viewer asset stats

added support for specifying predicates for xui and llsd serialization

final removal of remaining LLStat code

fixed predicate update logic and reduced to 2 classes

fixed llpredicate so that values and rules work uniformly with predicate logic
and/or/negate works in parallel with set/clear

converted "int" to "S32"

cleaned up predicate system, made unknown work with remove

improved predicate system, added uncertain/unknown predicates

sanitized param block code to accept isValid and isProvided at any point
added predicates to control serialization