#17 graceful error exit when out of file descriptors
#17 gracefull db open
#17 test env open with open file limit
#17 fix a memory leak
#17 fix closedir with null pointer bug in toku_get_version_of_logs_on_disk found by injecting open file errors
fix memory leak in test for #18
#27 test case for big txn and checkpoint blocking other commits
#27 test case for big txn and checkpoint blocking other commits
#27 bigtxn with checkpoints passes the bigtxn27 test
#27 rename the low priority multi operation checkpoint lock
#27 build on linux and osx
Refs Tokutek/ft-engine/#40 Add c_restrict_to_range function to force cursor to keep track of prelocked range
Refs Tokutek/ft-engine#40 Rename c_restrict_to_range to c_set_bounds, delete c_pre_acquire_range_lock
Refs trac 6712, Refs Tokutek/ft-engine#40 Reduce computation time when we read something out of bounds (do not look in other basement/leaf nodes)
Refs trac [t:6712], Refs Tokutek/ft-engine#40 When possible, optimize by only checking left or right bound during a bounded query