[WATCHDOG] v2.6.5-rc2 pcwd.c-patch3

Version 0.15 of pcwd.c - Changes that were made are:
* Rewrote code for exchanging commands with the ISA-PC Watchdog card
* Restructured + rewrote the init and exit code
* Added option_switches info
* Use the option_switches info to find out what the cards heartbeat is
* Added notifier support

Tested on pcwd card with temperature option