Add PAE kernel & headers & meta file to i386 CD pool directory

Currently the PAE kernel packages are only placed in the pool directory of the DVD image. Since machines with greater then 3G of memory are very common, and there is still a great need to have 32bit user space. Ubuntu should have these packages in the pool directory of the install media so ubiquity will see them and install it for systems with greater then 3GB of RAM.

The packages are
- linux-image-generic-pae package
- linux-image-generic-pae meta package
- liunx-headers-generic-pae package
- linux-headers-generic-pae meta package

Those are the 4 packages needed to go into the "pool" directory of the CD iso (not in the squashfs).