removed most obvious unnecessary Makefiles

This is a modification of PR #310, following discussion there.  I've added a self-contained Makefile for the shallow_sphere example, as a pattern for users who want to use their own Fortran routines.

The following Makefiles have not been deleted.  At least some of them can also probably be removed.

```
./development/DMPFOR/Makefile
./development/point_wise_rs/Makefile
./development/point_wise_rs/pyWrapperForRiemannSolver/Makefile
./development/rp_approaches/Makefile
./examples/iso_c_advection/Makefile
./examples/peano_shallow_2d/Makefile
./fvmbook/chap11/burgers/Makefile
./fvmbook/chap3/acousimple/Makefile
./fvmbook/chap6/Makefile
./fvmbook/chap7/standing/Makefile
./fvmbook/chap9/acoustics/interface/Makefile
```