type-break-good-rest-interval: Doc fix.

type-break-good-rest-interval: Doc fix.
type-break-keystroke-threshold: Calcuate based on 35wpm, not 30.

type-break-demo-function-vector: Variable deleted.
type-break-demo-functions: New variable.
type-break: Use new variable.

type-break-time-difference: Return absolute value.

type-break-format-time: New inline function (defsubst).
type-break-statistics, type-break: Use it.

type-break-mode: Just test prefix-numeric-value >= 0 to to enable mode.
The only visible difference is that invocation with no prefix arg the same
as if given positive numeric prefix arg now.
Do not document type-break-query-interval or type-break-query-function
here; make fritterware-happy users read the source.

type-break: If type break is much less (at least 2 minutes) than a "good
rest interval", ask user whether or not to continue with the break.

type-break-check: Do nothing if user is in the minibuffer.
When alarm is signaled but min threshold isn't reached, reschedule break.

type-break-demo-life: Eat char entered to end life demo.