Antpack

Added MultiChainAnnotator, LiabilitySearchTool and VJGeneTool. This
considerably expands the capabilities of the library to cover most basic
antibody amino acid sequence analysis tasks. Removed BioPython as a dependency
(it is not necessary to include a fasta file generator in SingleChainAnnotator
since any users using Biopython can easily add this themselves.)

Minor updates to alignment; fixed a bug relevant to old versions
of GCC that prevents compilation with old versions of GCC; removed
the scipy dependency; fixed the double-normalization issue.

Added scoring with a user-supplied mask, so that the
user can filter out regions they would like to not include
in the score. Also default to -O3 when compiling.

Fixed bug that caused gapped scoring (scoring where all
gaps are ignored) to yield masked scores only.

Added sequence scoring functionality for humanness.
Updated all numbering tools to improve behavior in
the presence of N-terminal deletions.

Added Kabat, Martin schemes.