Changes include patches to
* Handle gcc 4.4.1's foibles.
* Instrument {{{toku_os_pread}}}
* Release the lock during I/Os for queries (#3039)
* Simplification of the ydb lock (no more backoff)
* Use {{{DB_TXN_NOSYNC}} for several tests (which speeds them up).
* Set the redzone to zero for several tests (so they can run on machines with little free space). (#3111)
* Add helgrind and valgrind suppressions to some tests.
* Add dollar-id-dollar to several files.
* Declare the schedule status values to be volatile.
* Add a method to the toku {{{RWLOCK}}} to effectively grab the read lock and then release it quickly. (With only one condition variable acquisition.)
Fixes#3039. close[t:3039]
Refs #3111, #3112, #3119, #3125, #3126, #3128, #3131, #3133, #3142, #3152.
[t:3111] [t:3112] [t:3119] [t:3125] [t:3126] [t:3128] [t:3131] [t:3133] [t:3142] [t:3152].
git-svn-id: file:///svn/toku/tokudb@26785 c7de825b-a66e-492c-adef-691d508d4ae1
