New version: LowLevelFEM v1.7.0

[JuliaRegistrator]

• Registering package: LowLevelFEM
• Repository: https://github.com/perebalazs/LowLevelFEM.jl
• Created by: @perebalazs
• Version: v1.7.0
• Commit: e7778b84329b1de970ecc8c897e15a150312ebd8
• Reviewed by: @perebalazs
• Reference: perebalazs/LowLevelFEM.jl@e7778b8#commitcomment-150175095
• Release notes:

## New release: 1.7.0

### Bug fixes

### New features

Rotation of nodal coordinate systems using transformation matrix. Transformation matrix can be given with constant direction vectors or with functions. (With this arbitrary coordinate systems can be defined.)

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