vlt.data.columnize_struct

  vlt.data.columize_struct - turn all vector substructures into columns

  S_OUT = COLUMNIZE_STRUCT(S_IN)

  Given a structure S_IN, that potentially has structures as fields,
  return an almost equivalent structure S_OUT where all of the structure vector arrays
  are organized in columns.

  This function is useful because, when converting a Matlab structure to and from
  JSON using JSONENCODE and JSONDECODE, sometimes the row/column ordering of structure
  vectors is altered.