Trivial code cleanup.
Move libsrc stuff to libsrc/spatialdata.

Eliminates need to copy header files to $(top_builddir)/include.
Cleanup and update for automake 1.13.

Switch from INCLUDES to AM_CPPFLAGS.
Create check.am and module.am.
Eliminate use of TEST_ENVIRONMENT = $(PYTHON) (incompatible with
automake 1.13).
Add AM_PROG_CC_C_O due to mixing of C and C++ objects in test.
Merge branch 'baagaard/update-autoconf'

* baagaard/update-autoconf:
  Add AM_PROG_CC_C_O due to mixing of C and C++ objects in test.
  Cleanup and update for automake 1.13.
  Move libsrc stuff to libsrc/spatialdata.
  Trivial code cleanup.