GetGlobalLeaves - Return IDs of all leaves of a subnet that fulfill theSynopsis:
conditions given in the dictionary, or all leaves if no dictionary given.
>] GetGlobalLeaves -> [gid1 ... gidn]
This function recursively traverses a subnet and returns the global
ids of all leaf nodes in increasing order of gid. If a dictionary is provided,
only those nodes which fulfill the given criteria are returned.
The returned nodes DO NOT include the intermediate subnets. For a
variant of this command that also returns the subnets, see
gid - id of a subnet
> - Dictionary of selection properties
[gid..] - Array with the global ids of all leaf nodes.
Ruediger Kupper, Abigail MorrisonFirstVersion: