Disable "in-tree" builds. Update README.rst and INSTALL files

Remove instructions for 'in-tree' builds. Can we disable them?

At present, cloning a fresh copy of dolfin, and running

cmake .

fails

-- Copying demo and test data to build directory.
-- ----------------------------------------------
CMake Error at CMakeLists.txt:920 (message):
  Copy demo data failed:

  Traceback (most recent call last):

    File "/home/chris/dolfin/cmake/scripts/copy-test-demo-data", line 70, in <module>
      copy_data(sys.argv[-1])
    File "/home/chris/dolfin/cmake/scripts/copy-test-demo-data", line 47, in copy_data
      raise RuntimeError("destination directory cannot be the same as "\

  RuntimeError: destination directory cannot be the same as the dolfin source
  directory

Comments (4)