Optional rpath link option, CMake search path set, static WCSLIB

Thanks to a test build on Raul Infante Sainz's Mac OS computer, we were
able to address some issues and will be trying them after this commit:

 a) The LLVM linker on that computer didn't recognize `-rpath-link'! So at
    configure time we now check for it and only include it when the linker
    recognizes it.

 b) CMake corrections: 1) `CMAKE_LIBRARY_PATH' is now defined so CMake can
    look in our custom directory to find the necessary libraries. 2) To
    build and install the CMake built programs, we now simply use `make'
    and `make install'.

 c) To avoid particular linking problems with WCSLIB (which has special
    problems compared to other libraries), we are now deleting the shared
    library version (both on GNU and Mac systems).

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