Order "begin" probes are run

[Li Guanglei]

Stone, Joshua I wrote:

> This is now implemented -- you can give a numeric parameter to begin/end
> probes, and they will execute in increasing order.  The sequence number
> if left out is effectively zero.
> 
> We should adopt a convention for tapset writers to use these fields.  My
> suggestion: when it doesn't matter, just use begin/end without a
> parameter; to run early, use less than -1000; and to run late use
> greater than 1000.  This way script writers still have +/- 1000 to play
> with locally.
> 
> 
> Josh

Sorry for the late response. This is really a useful feature for LKET 
since LKET will perform some initialization work and without this 
feature it's hard to control the running order of begin probes.

- Guanglei