v1.4.11

• stfsender: allocate a buffer and copy stfs before sending (optional)
• stfsender: enable copying in standalone mode
• adopt to FairMQ API changes
• tfscheduler: optimize incomplete tf bookkeeping
• stfbuilder: decrease size of o2 header region
• ucx: fail from ucp_wait on error
• tfbuilder: monitor token success ratio
• tfscheduler: implement exclusive and shared tokens
• stfsender: fix termination of flp-only run
• tfscheduler: configurable number of tokens per StfSender
• tfbuilder: remove not needed monitoring metric