New hash_append robust container hash function framework:

* is_contiguous_hashable trait identifies optimizable types
* hash_append() function overloads for basic types:
  - scalars, floats
  - array, C array
  - pair, tuple
  - boost array and tuple (if configured)
* Provided Spooky hash wrapper for use with hash_append
* Use hash_append in hardened_hash and other places
* New Utility meta functions for working with variadics:
  - static_and
  - static_sum
* Added type_name utility function for diagnostics
* hash_metrics suite of functions to evalulate hash functions
* Test suites to measure hash function performance
* Various fixes

SConstruct

@@ -45,7 +45,7 @@ def print_build_vars(env,var):
 
 def print_build_config(env):
     config_vars = ['CC', 'CXX', 'CFLAGS', 'CCFLAGS', 'CPPFLAGS',
-                   'CXXFLAGS', 'LIBPATH', 'LINKFLAGS', 'LIBS']
+                   'CXXFLAGS', 'LIBPATH', 'LINKFLAGS', 'LIBS', 'BOOST_HOME']
     sys.stdout.write("\nConfiguration:\n")
     for var in config_vars:
         print_build_vars(env,var)
@@ -143,6 +143,8 @@ def main():
     env.Append(CXXFLAGS = [
         '-std=c++11',
         '-frtti',
+        '-O3',
+        '-fno-strict-aliasing',
         '-g'
         ])