minor docstring update
changelog update
update cpython versions in run_tests.sh
server/zeromq: Move context creation in __init__

Do not use global context because it prevent you from running multiple
zeromq servers in multiple threads. Instead, create a context in
__init__ method, or allow passing an existing context with ctx argument.
server/zeromq: Add socket argument

Add socket argument so it is possible to pass an already configured
socket to the server.
server/zeromq: Add ZeroMQThreadPoolServer for async calls

Launch a worker pool in background so this is possible to fire
simultaneous blocking calls to the server.
remove stray debug statements, other minor changes.
HtmlColumnTable: remove unused array_index argument
disable polymorphism in *Cloth

It seems to cause more problems than it fixes so far.
minor
add failing test for customized type deep in type hierarchy
remove useless "classes" deque

(now that we have topological sorting)
fix overgeneralized array/iterable duplicate prevention
better test name
sanitized resolve_namespace mess
docstring update
minor
also accept 'inf' and float('inf') as infinity values to max_occurs.
minor
It was made sure that only customizations that need a restriction tag generated one