More values for show_err

Registered by Federico Razzoli on 2013-05-01

When show_err = 1, TR dies on error. For backward compatibility, this behavior should be preserved. But show_err should be a bitmask, and at least these flags should be added:
* 2: run tear_down
* 4: run after_all_tests
* 8: run on_error if exists

NOTE: this is risky and can't be autotested without macros

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