LTT: Improve output consistency between single and beam

[DavidSagan]

The default of -1 is independent of the mode. I do not understand what the issue is. Please provide details.

[mattsignorelli]

Basically there is a lot of inconsistency between the output for single particle tracking and beam tracking. For example, in 10_LongTermTracking/ParticleTrack, use this init file:

&params
    ltt%lat_file = "ring.bmad"
    ltt%simulation_mode = "SINGLE"
    ltt%tracking_method = "BMAD"
    ltt%n_turns = 30
    ltt%averages_output_file = "data"

    beam_init%n_particle = 1
    beam_init%center = 0, 0, 0, 0, 0, 0
/

single.dat output shows every single element, and all of the data.* files are empty completely. Single tracking prints every element for the particle. Now switch the simulation mode to BEAM and the data.* files only show the last turn. The defaults are different.

Here is what changes I think should be made:

• Consistency between single and beam tracking output (both should either do every element, or every turn. Not every element for single, but the last turn for beam, as is currently done)
• For an open beamline, the default both for single (single.dat) and beam tracking (.ave, .emit, etc) should print every element
• For a closed lattice, the default for both single and beam tracking should be turn-by-turn