Squashed commit of the following:

commit f2560c7
Author: W <[email protected]>
Date:   Fri Mar 17 16:14:07 2017 +0100

    Add --map-compression-method to usage message

commit c71d26e
Author: W <[email protected]>
Date:   Fri Mar 17 16:00:12 2017 +0100

    Fix spelling of parameter name in usage message

commit 122ea06
Author: W <[email protected]>
Date:   Thu Mar 16 22:56:00 2017 +0100

    Fix help message for LZ4 compilation.

    As mentioned in drolbr#374 (comment)
    I'm adding missing lz4 information.

Author: mmd-osm

src/overpass_api/osm-backend/update_database.cc

@@ -112,8 +112,13 @@ int main(int argc, char* argv[])
   }
   if (abort)
   {
+#ifdef HAVE_LZ4
+    std::cerr<<"Usage: "<<argv[0]<<" [--db-dir=DIR] [--version=VER] [--meta|--keep-attic] [--flush_size=FLUSH_SIZE]"
+        " [--compression-method=(no|gz|lz4)] [--map-compression-method=(no|gz|lz4)]\n";
+#else
     std::cerr<<"Usage: "<<argv[0]<<" [--db-dir=DIR] [--version=VER] [--meta|--keep-attic] [--flush_size=FLUSH_SIZE]"
-        " [--compression_method=(no|gz)]\n";
+        " [--compression-method=(no|gz)] [--map-compression-method=(no|gz)]\n";
+#endif
     return 0;
   }