Add eggnog database version 5, emapper version 2

Solves Issue [#79 (closed)] and [#70 (closed)].

Support of emapper version 2 using the new eggnog database version 5 in addition to emapper version 1 using eggnog database version 4. (emapper 1 do not working with the new eggnog database of version 5) The new eggnog database version 5 comes with a test DB and is now integrated into the integration tests. The different versions need different Snakemake workflows and uses internally two different db_types (eggnog_v4, eggnog_v5) and two different tools (emapper_v1, emapper_v2). User configuration do not change, use {prog: emapper, db_type: eggnog, db_version: 5.x or 4.x}.