Copied the units_conv.c from 15 that includes the new units to master. Swept through the code removing includes to Unit.hh and UCF.h where they are no longer needed. Remade makefile dependencies. refs #231
So our unit tests did their job, they pointed to quite a few errors. Fixed them all on my platform (CentOS 7). refs #231
Created a check in the configure script looking for the udunits header files. Also added a sim to test some of the new units capabilities. refs #231
