[developers] Chart pruning: update

[Bart Cramer]

Dear devs,

a little update on chart pruning, as since today there is a small change in
the way chart pruning works. The ncheap binary will be updated by Stephan in
due time as well, for inclusion in the Paris snapshot of the LOGON tree.

There are now four ways of calling the chart pruning mechanism:

   - -cp=a1000 (all tasks, cell size = 1000)
   - -cp=s1000 (successful tasks, cell size = 1000)
   - -cp=p1000 (passive tasks, cell size = 1000)
   - -cp=1000 (defaults to passive)

The -local-cap and -count-tasks are now deprecated, so you will need to
update your cpu profiles in dot.tsdbrc. You always have to specify the
limit; no default is specified for that aspect.

Furthermore, I am very much interested in the results you have reached so
far porting the technique to your own grammars. Help can be provided
whenever needed!

Best,

Bart.
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