test: add RETURN_SKIP and RETURN_TODO macros

Added two new flags to identify tests that are intentionally ignored
(usually because we don't want to implement the tested functionality

test: add RETURN_SKIP and RETURN_TODO macros

Added two new flags to identify tests that are intentionally ignored
(usually because we don't want to implement the tested functionality
on current platform) and test serving as TODO list (usually indicating
that the tested functionality should be implemented on current plaform
in the near future.)

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test: remove 'is root?' check

I debug tests regularly as root (because dtrace and dtruss require the
additional privileges). The 'is root?' check gets in the way more often
than it p

test: remove 'is root?' check

I debug tests regularly as root (because dtrace and dtruss require the
additional privileges). The 'is root?' check gets in the way more often
than it prevents me from doing something silly. Remove it.

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test: add tap output

Given UV_TAP_OUTPUT being set, test result output should use TAP formatting

test, bench: ANSI-fy function prototypes

Replace `void f()` with `void f(void)`; the former means "a function
that takes any number of arguments, including none" while the latter
is

test, bench: ANSI-fy function prototypes

Replace `void f()` with `void f(void)`; the former means "a function
that takes any number of arguments, including none" while the latter
is what is actually intended: a function taking no arguments.

The first form also isn't strictly conforming ANSI/ISO C.

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test: fix -Wunused-result warnings

test: add UV_RUN_AS_ROOT check

test: add valgrind support

Run tests through valgrind when UV_USE_VALGRIND=1 is set in the environment.

test: fix error message in runner

test: prevent running the tests as root

test: remove unused variable

test: fix race conditions in test-async

test: remove dead code

ignore SIGPIPE in tests

Make it possible to run individual tests.

Fixes #100.

read() and write() return ssize_t, not size_t.

rv < 0 error checks were always false.

uv_sleep() takes milliseconds, usleep() microseconds. Convert argument.

unix: Use fork instead of vfork in runner.

Adds uv_get_exepath API

Only works on Linux, Mac, Windows currently.

oio -> uv

Use argv[0] if we can't get_executable_path()

Remove unnecessary function

Fix compiler warning

unix: implement OIO_ASYNC

Had to hack up the test to be inline with how libev does things.

unix: Stub out async and thread functions

Improve test-runner output

* fix rewind_cursor() for windows
* use stderr consistently
* let rewind_cursor() return void; closes #14