Natcap-rios

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* Allowing activity transition effectiveness to be floating point numbers rather than just 0 and 1.
* Removing the following unused outputs from RIOS:
* [objective_x]\objective_level_transitions subdirectory and contents
* continous_activity_portfolios subdirectory if budget_years == 1
* yearly_activity_portfolios subdirectory if budget_years == 1

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* Patching an issue that can occur in RIOS PORTER when a user provides a landcover map with an unsigned int datatype and a nodata value that exceeds 2^31. In this case the nodata value is arbitrarily set to -9999 on the output PORTER landcover map.

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* Patching an issue where a complicated RIOS run with many large raster files and many large vector files would cause RIOS to segfault when making the activity preference/mask layer during prioritization.

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* Fixing an issue where a user could put zeros across the transition columns and the activity score would get an "nan" when dividing by the total weight. Now setting denominator of weighted average to 1.0 in cases where the total weight sum is 0.0.

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* Patching a LOGGER.debug syntax error on the disk sort routine.

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* Addresses yet another memory issue related to large numbers of RIOS activities.