ark completed tasks under their account as deleted (task requester should receive notification email that task is completed)

Just need some revision and features added. I have attached the zip file that needs to be tweaked/worked on.

1. users should be able to

a. Transfer tasks from their accounts to other user accounts; as a service provider, they can transfer the tasks assigned to them to other service providers. Or as a service requester, they can reassign the tasks.
b. Mark completed tasks under their account as deleted (task requester should receive notification email that task is completed); as a service provider they can mark the tasks as completed/deleted. Make changes to their profile (modify the services they can provide, or the time they are available).

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