Added support for xep_pool process type with tests
Added xep_pool process code
Fixed bug in ProcessTree checking well ancestors and added further tests
Merge branch 'devel' into xep_pool
Further work on xep_pool process, including tests.

Added required functionality to ProcessTree.pm and tests.
Added input well validation to xep_pool process
Removed deprecated method from GenotypingQC.pm
Corrected implementation of addition of recombinase to the clone pick process
Added tests for clone_pick with recombinase
Added optional recombinase to 1st and 2nd electroporation processes, with tests
Corrected parameter validation in CreateProcess
Corrected grammar in comment on plate creation