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rewrote Compound interface in terms of standard elementary entities

Warning: this is work in progress and *will* break some existing examples (negative numbers etc.)

Point(2) = {0, -0.5, 0, .03};
Point(3) = {0, 0.5, 0, .03};
Point(4) = {-0.5, 0.5, 0, .03};

Point(5) = {0.5, -0.5, 0, .03};
Point(6) = {0.5, 0.5, 0, .03};

Line(1) = {4, 3};
Line(2) = {3, 2};
Line(3) = {2, 1};
Line(4) = {1, 4};

Line(7) = {3, 6};
Line(8) = {6, 5};
Line(9) = {5, 2};

Line Loop(5) = {2, 3, 4, 1};
Line Loop(6) = {8, 9, -2, 7};
Plane Surface(7) = {5};
Plane Surface(8) = {6};
Transfinite Line {4,8} = 20 ;
Transfinite Line{2}=20;
Transfinite Surface {7};
Recombine Surface {7};
Transfinite Line {3,1,7,9} = 10;
Transfinite Surface{8};

Physical Line("Border") = {1, 3, 4, 7, 8, 9};
Physical Surface("Inside1") = {7};
Physical Surface("Inside2") = {8};

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free to improve...)

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Rather than imitating MElements, each Cell maps to an existing or newly
created MElement and uses MElement's services to their extend.
This brings simplicity and memory efficiency.

pretty please do not just "throw;" when you don't know what to do

+ constify MElement some more