NEP-PACK 0.2.4

The release contains:

• Bugfixes
• New algorithm: ILAN - Infinite Lanczos Method for symmetric NEPs
• Support for LowRankNEPs
• New benchmark: bessel functions FEM model: nep_gallery("dtn_dimer")
• New tutorials: Interface with python, matlab, etc. https://nep-pack.github.io/NonlinearEigenproblems.jl/tutorial_matlab1/