modifies API recognition: VLKB-legacy only if 'l'&'b' params present in query string and synchronizes it with cutout/merge URL generation (VLKB-legacy or VO-Siav2)

separates search from formatting (Format filter parses own params as needed by VLKB-legacy extension)

docker: adds config-vlkb/ ssl/ and example compose-siav2.yaml and adopts Dockerfile and entrypoint.sh to vlkb-search only