Add information about BDECOPY_DATADIR and base config
Add information about BDECOPY_DATADIR and base config

See #9

linz/linz_bde_copy,linz/linz_bde_copy,linz/linz_bde_copy,linz/linz_bde_copy,linz/linz_bde_copy,linz/linz_bde_copy