FT-306 Fix logger long wait status text
FT-300 Block allocator trace replay tool
FT-307 Add a 'memcmp magic' API, where users can specify that a
particular value for the first byte of a key means it may be compared
with memcmp and a length check.

FT-50 Implement toku_builtin_cmp_fun with memcmp and a length check
FT-300 Fix OSX build
#263 add txn discard API stub
#263 add txn discard test
#263 rough outline
#263 xa recovery test cases
#263 snapshot
#263 add txn discard test
#263 rough outline
#263 snapshot
#263 dont checkpoint the rollback file
#263 rebase