biology/pbbam: PacBio BAM C++ library, with SWIG bindings

[jwb]

Summary

biology/pbbam: PacBio BAM C++ library, with SWIG bindings
Approved by jrm (mentor) or wen (mentor)
Differential to be added to commit message

Test Plan

portlint -AC: looks fine
Passed poudriere on {10.4,11.1}-{amd64,i386}
Tested in production

[jrm]

Sorry, I somehow missed this one in the deluge of emails. Lgtm.

[jwb]

No worries, I managed to find something else to do while I waited. ;-)