The function download XML files and png files from KEGG website to local disk
the KEGG pathway id, such as '00010'
the species id in KEGG database, 'hsa' means human, 'mmu' means mouse, 'rno' means rat, etc
the local directory where the downloaded files are saved
If pathway_id is set as 'all', all KEGG pathway ids in KEGG.db package will be used and downloaded from KEGG website
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