METALS-Copper eases from highest in over a week as dollar firms

* Dollar higher, pushing metals lower * Supply concerns underpin copper (Updates throughout, changes MELBOURNE dateline to LONDON) By Zandi Shabalala LONDON, March 29 (Reuters) - Copper touched its highest in more than a week on Wednesday on supply concerns and then steadied as the dollar picked up. Three-month copper on the London Metal Exchange was flat at $5,873 a tonne by 1025 GMT, after hitting $5,927.50, its highest since March 20. "There is still some uncertainty