Fixed mapping boxes' IDs and submitting too many IDs to KEGG

Major fix in mapping boxes IDs and positions in orthologs array

Difference between mapping by box.id and by the index in the pathway.orthologs array.

Also changed default "step" to 40

KEGG's API will report on less ID mappings if many IDs are submitted in the same request.
This will take much longer, but all information will be obtained.