Ability to change splits in a run

[mwhamgenomics]

At the moment for each run, we refer to splits by index:

idx  name
0    Level 1
1    Level 2
2    Level 3

This means we can name splits however we want, but the system breaks down if a run is repathed or a new sequence break is found:

idx  name
0    Level 1
#    skips found, so we don't do level 2 any more
1    Level 3

Maybe we need some way to version runs, and possibly record more than just the split index:

Some speedrun (v1):
  idx  name     displayname
  0    level_1  Level 1
  1    level_2  Level 2
  2    level_3  Level 3

Some speedrun (v2):
  idx  name     displayname
  0    level_1  Level 1
  1    level_3  Level 3