Expand help text re: --packed.
Expand help text re: --packed.

ocdtrekkie/capnproto,a-richardson/capnproto,bsn069/capnproto,bryce-gibson/capnproto,MarPiRK/capnproto,rcrowder/capnproto,pjulien/capnproto,joliss/capnproto,maurer/capnproto,khklau/capnproto,khklau/capnproto,Fraser999/capnproto,jparyani/capnproto,martindale/capnproto,nagyistoce/capnproto,vladon/capnproto,bryce-gibson/capnproto,maurer/capnproto,joliss/capnproto,mologie/capnproto,a-richardson/capnproto,zarvox/capnproto,modulexcite/capnproto,rcrowder/capnproto,mrdomino/capnproto,a-richardson/capnproto,Fraser999/capnproto,johnkdoe/capnproto,mologie/capnproto,maurer/capnproto,nagyistoce/capnproto,artillery/capnproto,martindale/capnproto,ocdtrekkie/capnproto,ligzy/capnproto,MarPiRK/capnproto,nagyistoce/capnproto,rcrowder/capnproto,geofft/capnproto,bsn069/capnproto,vladon/capnproto,hntrmrrs/capnproto,mologie/capnproto,kamalmarhubi/capnproto,bsn069/capnproto,ligzy/capnproto,jparyani/capnproto,johnkdoe/capnproto,johnkdoe/capnproto,mrdomino/capnproto,geofft/capnproto,vladon/capnproto,bryce-gibson/capnproto,mrdomino/capnproto,geofft/capnproto,artillery/capnproto,modulexcite/capnproto,kamalmarhubi/capnproto,martindale/capnproto,zarvox/capnproto,joliss/capnproto,khklau/capnproto,kamalmarhubi/capnproto,ligzy/capnproto,hntrmrrs/capnproto,ocdtrekkie/capnproto,hntrmrrs/capnproto,pjulien/capnproto,Fraser999/capnproto,jparyani/capnproto,modulexcite/capnproto,MarPiRK/capnproto,artillery/capnproto,zarvox/capnproto,pjulien/capnproto