reads the set of Boxes out from the level_* groups of a Chombo HDF5 AMR file
goes to all groups named level_n for level n = 0 to numLevel and fills the vector of boxes. HDF5 Handle must be set to the root group (the default location when the file is just opened.A handy *get everything* version of int read(HDF5Handle& a_handle, Vector<Box>& boxes)
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