When adding an argument, the default analysis should be the current analysis (if applicable).

[mtillman14]

If applicable, but current analysis is not desired, allow for changing the analysis. If not applicable, do not provide default, instead prompt for which analysis to select it from.

When copying an argument from one location to another (e.g. TBCMVelocity from analysis1 to analysis 2), if the analysis source is the same as the original analysis (e.g. TBCMVelocity in analysis 1 was generated by analysis 1), then when copying it, automatically use the new analysis's name. If not the same (.e.g. TBCMVelocity in analysis 1 is from analysis 3), then use the same analysis name as before (e.g. keep the analysis name for TBCMVelocity as analysis 3.

[mtillman14]

Both process & plot tabs need to be able to use variables from multiple analyses simultaneously.