Names in time_series_task args is too common

[phil20686]

There are number of special arguments in time_series_task that are too common, and if they conflict with the names of arguments in the fuctions it is wrapping then it is a problem. So, for example, no function with the argument "name" can currently be run, because that is one of the reserved arguments for the task name. We should make these less common by prepending aika_ or task_ etc as appropriate.