Exceptions being thrown in functional fingerprint generation.
Fixed bug in CircularFingerprint/biotypes (for FCFP)

Signed-off-by: John May <john.wilkinsonmay@gmail.com>
Consider implicit hydrogen counts in getNaturalExactMass.

Signed-off-by: Egon Willighagen <egonw@users.sourceforge.net>
Consider implicit hydrogens in exact mass utility.

Signed-off-by: Egon Willighagen <egonw@users.sourceforge.net>
Consider implicit hydrogens in natural abundance utility.

Signed-off-by: Egon Willighagen <egonw@users.sourceforge.net>