Gracefully shutdown upon reaching critical temperature levels. Prevents few
laptops (ThinkPad T61 and x61s, among others) from hitting the in-CPU reset.

Fix a typo in previous.

Use consistenly more meaningful messages in all envsys scripts.

Imported envsys 2, a brief description of the new features:
(Part 4: documentation and configuration files)

* Support for detachable sensors.
* Cleaned up the API for simplicity and efficiency.
* Ab

Imported envsys 2, a brief description of the new features:
(Part 4: documentation and configuration files)

* Support for detachable sensors.
* Cleaned up the API for simplicity and efficiency.
* Ability to send capacity/critical/warning events to powerd(8).
* Adapted all the code to the new locking order.
* Compatibility with the old envsys API: the ENVSYS_GTREINFO
and ENVSYS_GTREDATA ioctl(2)s are supported.
* Added support for a 'dictionary based communication channel' between
sysmon_power(9) and powerd(8), that means there is no 32 bytes event
size restriction anymore.
* Binary compatibility with old envstat(8) and powerd(8) via COMPAT_40.
* All drivers with the n^2 gtredata bug were fixed, PR kern/36226.

Tested by:

blymn: smsc(4).
bouyer: ipmi(4), mfi(4).
kefren: ug(4).
njoly: viaenv(4), adt7463.c.
riz: owtemp(4).
xtraeme: acpiacad(4), acpibat(4), acpitz(4), aiboost(4), it(4), lm(4).

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