Fixed Windows issues with multiprocessing/memory mapping
Made parser share memmap char * pointer across processes
Added use_fast_reader/writer=None to test fixtures
Made converters avoid char* to bytes conversion for fill_values check when possible
Switched to only True/False for use_fast_reader/writer
Reverted addition of use_fast_reader/writer=None to test fixtures

This reverts commit ea905286155edbd8b8b0e6037a0db9487f5d0769.
Fixed speed issue with output formatting in FastWriter
Made carriage return newline checking in tokenizer more efficient
Moved include/exclude column handling to conversion step, restructured header tokenizing
Restructured tests and fixed a str/unicode issue
Made string conversion more efficient
Added a separate section in the io.ascii docs for fast reading/writing
Mentioned possibility of parallel failure for quoted values in docs
Added new subsection for parallel/fast conversion options
Improved fast converter, potential error no longer scales with the precision of input
Fixed line ending issue, added back reading tests, included new params in docs
Made xstrtod cache all possible powers of ten in memory
Made splitlines method of FileString more efficient
Made C string->Python string conversion work with Python 3
Fixed a couple issues with xstrtod()