Matrices should be represented in row-major format

[alvarohm]

The syntax will be more intuitive.

The metamodel. syntax and semantics need to be changed.

This replaces issue #51

[alvarohm]

To be consistent with matlab and numpy, vector will be row-vectors by default. If a column vector is desired, a n-by-1 matrix is created.

row vector: [1,2,3]
column vector: [1;2;3]

[alvarohm]

I have updated the metamodel, syntax and semantics. These are in new branches called row-major in each repository.

I have also checked that the robosim and physmod plugins remain compatible (by code inspection).

There is currently an issue with the declaration of core_int, which may introduce a cycle through the use of inner products.