#170 complete write tests for status quo

fix regression: nitems adjusted at the wrong location

#184 start implementation of the flush feature

#170 first basic write tests

fix doc error for cxBufferWrite

#170 add cxBufferClear test

#170 add several more buffer tests

fix cxBufferMinimumCapacity not using the allocator

do not implicitly zero freshly allocated memory

fix cxBufferMinimumCapacity implementation still using additional_bytes

fix erroneous doc for cxBufferShift

#170 first buffer tests

(0) -300 -100 -12 +12 +100 +300 tip

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