remove currently unused ssize_t definition

#170 test cxBufferRead

#170 test cxBufferGet

#184 #170 more thorough flush testing

fix two tests reading one byte too much

fix putc tests to make more sense of the bitwise or

fix obsolete documentation

improve hash key handling

#189 #199 implement and test map rehash

#199 test removing via iterator

(0) -300 -100 -10 +10 +100 tip

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