Setup hash float function config for Tru64 on alpha and add some comments on

the different libraries & compilers.


[SVN r28138]

libs/functional

@@ -1 +1 @@
-Subproject commit ca202ee1421e3066d2b2417e277e527e99c49351
+Subproject commit 952d73da6b682fef475cedca8053d532497c62e8