Radical.entk

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- RTD fix
- Consistent doc theme across RCT
- switch to a thread based instead of process based tmgr

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- fix RTD
- fix ZMQ bridge in `AppManager`
- fix session handling for `TaskManager`

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- add means to annotate dataflow
- extend coverage for Pipeline validation
- update file id (`[task_uid:]file_name`) parsing procedure

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- added tool to extract the provenance graph (from Pipeline & from JSON)

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- added log messages to track TaskQueue
- introduced service task
- added mongodb reconnect for a thread with `rp.TaskManager`
- added tests (service tasks, pilot cancelation)
- extend num digits for `Task.uid`
- fixed reattempts and sizing for `task_queue`
- moved MDB reconnect into TMGR mp.Process (thread safety)
- removed excessive log message (when queue task is empty)

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- enable GPU sharing (convert `gpu_process` from type `int` into `float`)
- updated requirement for RP (>=1.22)