UI/API changes

• FIX: Represent multi IP hops in traceroute tables
• FIX: Measurement detail manage: Get max number of participation requests (1024)
• FIX: Write-off button text in probe detail manage panel
• FIX: Don't show troubleshooting info for written off probes
• FIX: Measurement form: Clarify country spread option, prevent tag selection if used
• FIX: Measurement form: Remove invalid "All" option from country selection
• TWEAK: Improved mobile handling for probe overview
• TWEAK: Auto-expand quick start widget when switching roles if closed