Remove generated javadoc from source repository.
Remove temporary files.
Add initial debian packaging.
Ignore .pc directory
Rename JNI library to "cldjava" to avoid potential conflict.

C++ CLD library is also named "libcld.so" (ie. inside /usr/lib/ system path)
so it can conflict with "libcld.so" JNI interface build in ports/java.
Install C++ libcld.so into /usr/local/lib instead of /usr/local/lib/cld/ subdirectory.
Once installed into /usr/local/lib it will be in default LD_LIBRARY_PATH.
Use local (ie. just built) headers and library instead of expecting system ones.

This allow a unified "C++ and Java port" built without manual installation of system lib.