MT#7867 Add xml element among others by position.

Only y (vertical) position is used now.
No reordering on element movement.
Unit version is under testing.

(cherry picked from commit 146a7ef354fa2a383d521f5466e7bf5c063454f3)
MT#7867 Use geo to place xml string for inter-layer elem movements

(cherry picked from commit e544dc4f0794a3afe4ea85d29a95156265c52bde)