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HTGSource: support distribution of trees in string descriptor

Louis Gombert requested to merge louis.gombert/vtk:htg-source-parallel into master

Prefix root-level trees in HTG Source string descriptor with a process number, making them appear only on a given parallel piece.

For that, prefix tree letters "." or "R" with a digit to assign it to a distributed piece. The digit prefix acts as a switch, active until another digit is specified. For example, the string descriptor

0R.R 1R 0RR 2..R | [...]

will assign the first 3 trees to piece 0, the next one to piece 1, the 2 next to piece 0 and thelast 3 to piece 2. This logic supports up to 10 different pieces in the descriptor. The digits in the descriptor must match the number of pieces requested from the source.

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