Change name prefix from aln_ to rapi_
Rename rapi.c to rapi_test.c
Reduce author list
Reorganize directory structure

This commit puts the headers in a separate directory, the BWA wrapper in
another (from which a static library is built) and the "rapi_test"
program is moved into an examples directory.
Remove the rest of the "wrappers" directory
Modify build to link directly to libbwa.a

The previous strategy consisted in compiling the few files from BWA that
interest us from within the context of this project.  A better strategy
is to link directly against the static library produced by BWA itself.
Initial SWIG interface definition
Makefile to build SWIG-based Python interface