build: improve configure.ac, remove some cruft
build: (carefully) introduce libtool into the mix.
build: improve configure.ac
build: extract BamTools files into separate library.
build: Test program use libbamtools.a
build: make LobSTR use libindex.a
build: add static linking option.

To build a static executable:
     $ ./configure --enable-all-static
build: lobstr-test executable now uses libindex.a