Write minimal columns#154

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Bengreen wants to merge 4 commits intoSegfault-Inc:masterfrom

Bengreen:write_minimal_columns

Commits on Jun 8, 2016

Split out declarations and definitions into .h and .c (apart from static FWD declaration)
Ben Greene
committed

Commits on Jun 9, 2016

Change write API so that it only writes the columns that are modifed, not every column
Ben Greene
committed

Commits on Jun 13, 2016

Add description into setup.py
Ben Greene
committed

Commits on Jun 14, 2016

Merge with make_rpm to enable building of RPM files
Ben Greene
committed