psm - Sync psm(4) with FreeBSD

psm - Sync psm(4) with FreeBSD

Changelog:
- Support for A4 Tech RFSW-35 mouse wheel.
- Ignore strange return values in test_aux_port()  from some laptops
  (Compaq, Toshiba, Acer).
- Support synaptics touchpad w/ many features such as supporting integrated
  wheel, up/down buttons or tapping.
- Synaptic tunables hw.psm.tap_enabled and hw.psm.synaptics_support to control
  activation and/or features like gestures.
- Fix many issues with buggy KVM switches which got the mouse confused on sync
  packets.
- ALPS glide point ID.
- Let some PS/2 mice to get directly to Explorer mode (i.e. A4Tech X-7xx)

Obtained-From: FreeBSD