New version: LowLevelFEM v1.8.0

[JuliaRegistrator]

• Registering package: LowLevelFEM
• Repository: https://github.com/perebalazs/LowLevelFEM.jl
• Created by: @perebalazs
• Version: v1.8.0
• Commit: 90ea3bc2ada59e9a8e2c6e99fa3e62435efba030
• Reviewed by: @perebalazs
• Reference: perebalazs/LowLevelFEM.jl@90ea3bc#commitcomment-152375055
• Release notes:

## New release: 1.8.0

### Bug fixes

- Some corrections in the documentation.

### New features

- Buckling,
- Modal analysis of prestressed structures,
- Latent heat matrix (to solve heat generation due to deformations),
- Shorter scripts for simple problems,
- Resultant of force, stress or heat flux fields on an arbitrary physical group (nodal forces are summed up, distributed quantities are integrated).

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