UCVMC fails to run due to Proj.4 Error

[hzfmer]

The UCVMC program uses the proj-5 library specified by the environmental variable PROJ_LIB, which can cause a mistake if not set properly:

Failed to create output UCVM projection
..
Failed to initialize UCVM map
Failed to initialize UCVM API

One of the reasons causing this problem is Anaconda may set this variable when installing some packages, e.g. GMT6.

Fix the problem
Unset the variable PROJ_LIB.