Don't map BARs < page size by default. Offer a map_mode flag to allow unsafe mapping of BARs. Addresses #24 and #25.
Correct in_range test for BAR mapping. #24
Problem analysis in 5811851146e1d4b9915f60968376eb65d8f4abb8 was wrong. error() sets AH and we need to check it. But we better make sure it is 0 before...