* Remove support for the "common" installation location from packagefs,
package kit, package daemon, package managers.
* Rename the B_COMMON_*_DIRECTORY constants referring to writable
directories to B_SYSTEM_*_DIRECTORY.
* Remove/adjust the use of various B_COMMON_*_DIRECTORY constants.
I'm sure some occurrence still remain. They can be adjusted when the
remaining B_COMMON_*_DIRECTORY constants are removed.
* We first process the node monitoring events, collecting the required
package activation changes, then apply all changes together.
* Change the PackageFSActivationChangeItem/-Request structs. The former
is no longer variable in size, which makes it easier to work with.
* Add PACKAGE_FS_OPERATION_GET_PACKAGE_INFOS which returns the node refs
of all packages activated.
* Add PACKAGE_FS_OPERATION_CHANGE_ACTIVATION to activate/deactivate
multiple packages.
