Function writes a process start message and performs some diagnostics
This argument allows to establish a hierarchy of print statements. The hierarchy is preserved for the next vcat executions. Currently this setting can have 4 states: NULL (nothing will be changed), 0 (reset hierarchies), "+" (increase hierarchy level by 1) and "-" (decrease hierarchy level by 1).
a list containing diagnostic information required by
Jan Philipp Dietrich
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