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Print names generation

When defining a plArray, the print name of each of the contained variables is generated by the following rule:

1. if the dimension is one, then the variable names are generated as:
   <plArrayPrintName><index>

   where <plArrayPrintName> is the plArray print name passed as argument to the plArray and <index> is the index of the variable. For example, plArray oneDvelocity("Va", relative_velocity, 1, 3); generates the following print names ``Va0'', ''Va1'' and ``Va2''.

2. Otherwise, the variable names are generated as:
   <plArrayPrintName>'('<index>')'

   For example, plArray twoDvelocity("Vb", relative_velocity, 2, 3, 2); generates the following print names ``Vb(0,0)'', ''V(0,1)'',..., ''Vb(2,1)''.