Add our standard "experimental" and "control" accessors.

(This way refaligns can also be used as the source builds in
`genome model somatic-validation manual-result`.)
Find the result specific to our event.
Try calling the new accessors.
Merge pull request #290 from tmooney/qc_segmented_results

Find the result specific to our event.
Merge pull request #288 from tmooney/add_sample_accessors

Add our standard "experimental" and "control" accessors.