Charge injection

Implement high-level function to set, unset, and read charge injection. A feature to be implemented still is to have the charge injection work with the ETROC_Emulator.py file for more accurate baseline values in the runL1A method.

requested review from @apeck and @dspitzba

assigned to @dlopezgu

added 36 commits

• 9322dc1d...eb63c728 - 34 commits from branch master
• e464ea17 - minor test data read fixes
• 0d9947d3 - Merge branch 'master' into chargeInjection

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merged