若干小改进#286

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akofer wants to merge 8 commits intoidealvin:masterfrom

Commits on Dec 31, 2022

解决两个烦人的编译器 warning:
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"$ cmake .. && make test" hangs on some standalone tests, seperate them from other tests
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make some tests runnable by "make test" or "ctest"
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improve tests
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change the default server port from 80 to 8080. ports below 1024 are kept for super-user on unix.
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stack.cc is actually a death test. let's leave it away.
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Change the default connection num to 256.
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improve fs api a little bit.
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