Move 180.60 from testing to release

Release Highlights:

*  Fixed VGA console restoration on some laptop GPUs.

* Fixed a bug that caused kernel crashes when attempting to initialize NvAGP on Linux/x86-64 kernels built with the CONFIG_GART_IOMMU kernel option.

* Fixed a bug that caused some performance levels to be disabled on certain GeForce 9 series notebooks.

* Fixed crashes in Bibble 5.