report slow run throughs of a worker, should help identify a problem
allow stack size to be larger than we set ages ago.

the stack was reduced because of the trunk build using 1 thread per stream model
doing so allowed many streams to run.  As the KH build has N workers, the scaling
to many streams is not constrained.
annoying to backward compatible (2.x) setting for external apps
update ssl loader to handle ciphers, keeps in sync with 2.4.x
minor change, web pages could do with updating to newer standards
update build scripts for kh11

This release has been waiting around for too long. many people have already
been using it from github and just some minor stuff at the end to tidy up.
Most of this commit is down to the updates in auto tools but the nsis file
also has new paths to the libs which seems to be more focused on using DLLs
for all the libs.