Also "make check" accepts TESTS argument for test suite. For instance:

make check TESTS=ffi

will run FFI tests suite.

Change urls of project and repository and remove obsolete code.

Signed-off-by: Daniel Kochmański <dkochmanski@turtle-solutions.eu>

  it possible to keep different build dirs handy).

The build system has been cleaned. The --with-system-* options now can automatically detect the existence of GMP and Boehm-Weiser libraries

Split the compiler flags into CFLAGS (used only when building ECL) and ECL_CFLAGS (exported into ecl-config). Set the value of SHELL explicitely in the makefiles so that they work when SHELL=/bin/csh in the environment.

ECL now follows the GNU coding standards for handling the configuration parameters prefix,libdir,bindir...

program and libraries are named ecl*. Finally the routine sys::build-ecls
has been renamed sys::build-program.