[Jprogramming] jtask spawn and fork no longer exported to z-locale

[bill lam]

Please be advised that spawn and fork in jtask locale are no longer
exported to z-locale.  It means that ,

1, you can freely assign any choice for these names without any
   conflict with J base library and addons.
2. use qualified names: spawn_jtask_ or fork_jtask_ in codes.
3. export them to z-locale in profile.ijs or startup.ijs if
   the old behavior is wanted. eg. fork_z_=: fork_jtask_

the base library and addons have already qualified spawn for years, but
this time, they no longer states in z-locale.

@John Baker, please review jod addons and make a new release to work with
the new base library.

Sorry for any inconveniences.

-- 
regards,
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