simplification of c_convolve.c
fixes to fraction2domain.bash, double prec fraction and fix to land mask ncap2
Reworked search catchment.

Speed and algorithm improvements:
- Tracks and saves path - either in or out of catchment.
- If new path encounters a point that is out (-1) or in (1), the paths are joined and we break out of the search loop
- Still tracks path length (cells / count_ds) and returns sorted arrays for make_uh computations.

This is likely to have significant speed up implications for large basins.
Fixes to north south indexing convention.

The formalized convention is now: the y-dimension 0-index position
corresponds to the highest latitude.
add better fractions plotting routine.
updates to read forcing and history file unit conversion
Improvements to RVIC parameter file generation processes

- now allows input pour points file to include x and y index locations (0, 0) is nw flow direction domain corner
- now correctly checks for latitude order after remapping
- now includes two new variables in output parameter file (outlet_upstream_area, and outlet_upstream_gridcells)
- fix to VIC flow directions
add fix to make sure outlet names are only ascii characters
Merge pull request #3 from jhamman/hotfix.0.0.4

Hotfix.0.0.4