If a big truncate fills the cache, there is no point retrying.

refs #757
I meant to put the __VERBOSE_OUTPUT_PERCENTILE #ifdef back so we don't
dump out quite so much information by default, but forgot.
No need to clear metaconf, we're returning.
lint
Add timestamp and pid/tid to messages. #753
Cast pthread_self for printing.  #753
Fix pthread_t print issue. #753
Print tid via call to new __wt_raw_to_hex_mem function. #753
Fix build warning:

../src/support/hex.c:49:9: error: variable 'len' set but not used
[-Werror=unused-but-set-variable]
Cleanup based on Keith's comments. #753
Fix another GCC/clang warning on OS X:

support/hex.c:42:80: error: implicit conversion loses integer precision: 'unsigned long' to 'uint32_t' (aka 'unsigned int') [-Werror,-Wshorten-64-to-32]
Update "wt stat" with an "all" command line option for the new statistics API.
Merge branch 'develop' into fine-grained-durability