Trying to delete the subclients in the event loop, to prevent leaving sockets open.

The old mechanism would lead to resource starvation when creating many subclients (e.g. in a loop).

Please report any issues with subclients -- this is quite a big change :-)



git-svn-id: https://geuz.org/svn/gmsh/trunk@17218 59c8cabf-10d6-4a28-b43f-3936b85956c4