Session progress fix

[bboudaoud-nv]

This branch fixes a bug that appears to have been created when merging trial-level configuration that prevented:

1. Session-level progress from being logged to the Status.sessions.csv file
2. Pretrial feedback from being cleared prior to the trial

These issues both seem to be sourced from the changes supporting trial-level config merged in #392.

[bboudaoud-nv]

This branch has merged the 2IFC_Sample (#401) for testing, it should be merged back to master after an initial merge of that branch or modified to avoid checking in this files from another branch.

[bboudaoud-nv]

Most fixes in this branch come from changes in the FPSci state machine management in #392.

For example, the trialFeedback state is no longer used to present the reference target/clear feedback messages, thus an explicit clear of feedback needed to be added when leaving the referenceTarget state.

Similarly a left-over moveOn = true was updating to a new session regardless of whether questions at the end of a session were answered.

Finally an interaction between how the user menu is shown between sessions and a special case for handling showing the menu at startup were interacting to show the user menu between trials in the first session, this has now been corrected.

[jspjutNV]

This has fixed the lack of progress issue.