I propose a change to zaobjts, zeobjts, zobjcts

For some reason, Magical Terrain (or Terrain Overlay, Wiki) has different behaviour on mines.

Gem and ore mines are placed underneath the terrain overlay, while others are placed above.
Without Magical Terrain:

With Magical Terrain (Gem and Ore are covered):


It doesn't look like placing a map object underneath the overlay would bring any benefit, so I decided to standardise the behaviours.
With Magical Terrain (All the mines can be seen):


Updated zaobjts, zeobjts, zobjcts with this change
Download: here.

Update:
Unfortunately, my trick on text doesn't work on existing maps. The passibilities are written on the map and won't be changed by updating text.
It will most likely only work for random maps.
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Almost forgot, there is another proposal:
Updated resource.def, with Mithril frame added. (was this made by Grossmaster?)
Download: here