Install static library and header files

Install static library and header files

Modify Makefile to install the static library and all of the library header
files.  Add dissect.h to LIB_H.  Remove redundant headers from dependency
lines.  Remove rpath suggestion.

The header files get installed to a "sparse" subdirectory of the include
directory; please reference the sparse headers as sparse/${HEADER}.h.  The
various sparse test programs can all now compile successfully outside the
sparse tree, given that modification to their #include lines.

Signed-off-by: Josh Triplett <josh@freedesktop.org>