libpacman: Make pmgraph_t::children not a pointer.
libpacman: Make Group::packages not a pointer.
libpaccman: Make Handle::dbs_sync not a pointer.
libpacman: Make trans->packages not a pointer.
libpacman: Make FPtrList swapable, but not copiable (to fix some bugs when removing items from lists without a proper copy). Plug a leak _pacman_list_remove.
libpacman: Make Transaction::syncpkgs not a pointer.