Task Control and Worker Communication

Control task code execution and communication among workers during job and spmd block execution

Functions

`addAttachedFiles`	Attach files or folders to parallel pool
`labindex`	Index of this worker
`numlabs`	Total number of workers operating in parallel on current job
`gcat`	Global concatenation
`gop`	Global operation across all workers
`gplus`	Global addition
`labBarrier`	Block execution until all workers reach this call
`labBroadcast`	Send data to all workers or receive data sent to all workers
`labProbe`	Test to see if messages are ready to be received from other worker
`labReceive`	Receive data from another worker
`labSend`	Send data to another worker
`labSendReceive`	Simultaneously send data to and receive data from another worker
`getCurrentJob`	Job object whose task is currently being evaluated
`getCurrentCluster`	Get cluster object from a worker in a cluster
`getCurrentTask`	Task object currently being evaluated in this worker session
`getCurrentWorker`	Worker object currently running this session
`getAttachedFilesFolder`	Folder into which AttachedFiles are written
`updateAttachedFiles`	Update attached files or folders on parallel pool

`parallel.Task`	Access task properties and behaviors
`parallel.Worker`	Access worker that ran task