Singular.jl 0.5.2 released

Today Singular.jl 0.5.2 has been released.

Diff since v0.5.1

Closed issues:

• Extracting constants from Singular polynomial rings over Nemo fields (#172)
• Singular solve segfaults for univariate polynomials (#187)
• Singular prints unwanted verbose output (#382)
• Implement tail for polys (#397)
• GC.@preserve missing for pointer_from_objref (#400)
• factorization over extension fields (#409)

Merged pull requests:

• Import, export and test tail for MPolys. (#405) (@wbhart)
• Import/export trailing_coefficient from AA and add tests. (#407) (@wbhart)
• Add an option to silence the banner using the SINGULAR_PRINT_BANNER ENV (#408) (@YingboMa)
• update types allowed in factor (#410) (@tthsqe12)
• add more gc protection (#411) (@tthsqe12)
• getting the elements out of the n_unknown (#413) (@tthsqe12)
• Bump Singular version (#414) (@thofma)