v1.1.1 - Smaller fixes

[1.1.1] - 2026-09-28 - Smaller fixes

Added

• Dual-antenna GNSS heading post-processing: new heading.csv file format.
• config.yaml option imu: mount_rpy_deg: the sensor board's attitude in the
  body frame, corrects at once accelerometer, gyroscope and magnetometer
  attitude (without the need to set individual misalignment matrices).
• Range aiding to known anchors (no full tight coupling yet though).

Changed

• inspostgui.py several small tweaks and bug fixes to improve quality of life.
• Post-processing: score: leverarm_frd fixed: a reference taken at the GNSS
  antenna no longer shows the lever arm as a height or position offset.
• Post-processing PDF output: The North-East map marks the start and end of the
  estimated track.

Fixed

• nav_suite: the local-height/GNSS offset filter was fed the antenna's
  ellipsoid height against the IMU's local height, so it absorbed the
  vertical GNSS lever arm.
• ins auto-init bootstrapped the IMU at the GNSS antenna's position. It
  now starts at the fix minus the lever arm rotated with the bootstrap
  attitude (only its vertical part while the yaw is unknown).
• ins re-acquisition after an expired coasting window rotated the lever
  arm with the attitude frozen at the start of the outage.