Remove the use of `bats` in testing

[underwoo]

Is your feature request related to a problem? Please describe.
The Bash Automated Testing System (bats is currently used to produce TAP style output. Using bats adds an additional requirement in order for a user to test the build of FMS, especially since bats is not a base package installed by *nix OSes. We would like to have bats removed from the testing scripts for libFMS.

Describe the solution you'd like
Ideally, we would like to have a solution that would preserve the TAP output, but we understand that may be difficult as it may introduce a dependency on some other utility. Thus, we would like some basic solution that will work with both the test harness system built into both GNU Autotools and CMake build systems.

[edwardhartnett]

I would propose to solve this with the solution I describe in #169.

Regular sh shell scripts can be used to run tests, as is done in netcdf-c, netcdf-fortran, HDF5, PIO, and other packages. Since sh is standard on all unix systems this is maximally portable. These scripts are then run from Makefile.am and CMakeLists.txt files. (See netcdf-c for good examples.)

[underwoo]

Your proposal in #169 is sufficient.

[edwardhartnett]

Actually the TAP style output is not a problem for the shell scripts, so we can keep that.

[edwardhartnett]

OK, actually TAP style output is a huge pain. So I will jettison that desirement...