Increase default evaluator stack to 6000.
Improve code style in call_tick_events()
Cleanup events/callouts in DEBUG mode, so valgrind don't complain.
Delete old bat file.
Revert "Run IO loop for at least 1 second. reduce unnecessary spin."

This reverts commit bffcfdcdf9d6292066eedecaac22904670307d4a.
Merge pull request #165 from sunyc/master

More changes to 7.4