[Upstream PR #33-35] iSpin.tcl updates

[montge]

Upstream PRs

• Update ispin.tcl nimble-code/Spin#33
• Update ispin.tcl nimble-code/Spin#34
• Update ispin.tcl nimble-code/Spin#35

Summary

Various updates to ispin.tcl (GUI interface).

Status

• Review PR changes
• Test implementation
• Evaluate for inclusion in fork