Add new functionality to TruSeq RNA protocol

[jgruselius]

1. Add centrifugation after mixing sample and reagents
2. Add tRobot incubation
3. Add possibility to do final hold
4. Add sealing of plate before 1–3 and at end (conditionally, if last protocol in runset)

Also changed:

• ~“With-bead” protocol in adapter ligation (beads are added once, then kept after elution and present in following reactions)~.
  • Implemented and tested but did not work good.
• ~Related to above; CA purification is separated into three modules: Bead wash, purification, elution.~
  • Implemented and tested but did not work good either.
• The RoboCut size selection will be swapped out for a regular CA purification.

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• [x] Part 1: mRNA purification, fragmentation and cDNA synthesis
• [x] Part 2: A-tailing, adapter ligation