Add writing support#46

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TonyLianLong wants to merge 5 commits intoqueryverse:masterfrom

TonyLianLong:writing_support

Commits on Mar 10, 2019

Add writing support
TonyLianLong
committed

Commits on Mar 20, 2019

Add libreadstat into readstat_begin_row and readstat_end_row, pass pointer into readstat_begin_writing
TonyLianLong
committed
Add handle_write and fix several syntax errors
TonyLianLong
committed

Commits on Mar 24, 2019