A couple of new routines to query usage of children
The type timer_t got two new kind of methods to query information about the resource usage if its children. The method %get_in_children queries the seconds spent in all children of the queried node, and %get_without_children conversely returns the number of seconds spent excluding all children. Additionally, there also version where the node in question is passed directly instead of by a string path (*_node) and versions where the result is a type(value_t) with all measurements (get_value_*).
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