The maximum duration of a Delay is limited by the size of a SmallInteger
parameter passed to a primitive in the virtual machine. Class LongDelay
implements delays of longer duration using a collection of Delays of the
required total duration. LongDelay attempts to mimic the behavior of a
Delay, including proper cleanup when a waiting process is terminated
prior to expiration of the LongDelay.

A LongDelay keeps a list of short delays, with a process that waits
for all the short delays to expire. The process is given a meaningful
name in the ProcessBrowser in order to reduce the risk of accidentally
terminating a valid delay watcher process.

To wait for one year, evaluate:
    (Delay forSeconds: 365 days asSeconds) wait

To see how it works without waiting for a year:
    | time1 time2 |
    LongDelay initializeForTesting.
    time1 _ Time millisecondClockValue.
    (LongDelay forMilliseconds: 5731) wait inspect.
    time2 _ Time millisecondClockValue.
    LongDelay initialize.
    self notify: 'LongDelay returned after ',
        (time2 - time1) asString, ' milliseconds'.

The actual duration of a scheduled LongDelay may have inaccuracies
due to cumulative errors of its sequential short Delays.

A LongDelay relies on a process to wait for the expiration of its
sequential short Delays. If this process is terminated, the LongDelay
will not complete normally. The process is given a recognizable name
in order to reduce the likelihood of accidental termination.

Other changes introduced by this change set:
- force to integer parameters when creating a Delay (all methods)
- add Delay>>#printOn: to display duration of the delay
- add Delay class>>maxVal to specify maximum duration of short Delay
- instantiate Delay or LongDelay as required based on duration

Dave

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