Update affymetrix.php

fixed typo
Update clinicaltrials.php

fixed typo
Update drugbank.php

fixed download url typo
Update goa.php

fixed download url typo
Update interpro.php

fixed download url typo
Update irefindex.php

fixed download url typo
Update omim.php

fixed download url typo
Merge pull request #294 from micheldumontier/release3

fixed download url typo