[Bug 3599395]: http assumes status line is a proper tcl list. 
Bump http package to 2.7.11.
[Bug 3599395]: http assumes status line is a proper tcl list.
more NRE abstraction
more info hiding: stop using the macro version of NRAddCallback
code reorg, trying to make it clearer who needs to know what about NRE internals
adding new file, forgotten in last commit
fix off-by-one error introduced in bd7d7a2061
merge trunk
tailcall now running in a simpler model, with no eval-flags and no nre-stack rewriting.
tailcall now running in a simpler model, with no eval-flags and no nre-stack rewriting; yieldto also requires one fewer bounce. Mostly from mig-nre-mods
bring in improvs from trunk
merge mig-nre-mods