Some metric names in PipelineSweeperSupportedMetrics incorrect #272

PipelineSweeperSupportedMetrics in InputBuilder.cs contains some metric names, such as "L1" and "L2", which are incorrect, and should be named as "L1(avg)" and "L2(avg)", etc. This will require changing these names in InputBuilder.cs to the correct names (which show up in the schema of the output from the train test macro). There are several of them, which should map back to what is used in the evaluators.