* Added module/plugin system (src/gnc-module/*)
* reshuffled source code from src/engine, src/register, and some
from src/guile, src/scm, src/gnome (see src/README.modules).
engine, backends, register, qif importer are now "modules".
* unfinished new QIF import/export module (the old one's still
there and still works)
* really too many files touched to get into it.
git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@5075 57a11ea4-9604-0410-9ed3-97b8803252fd
