Singular.jl 0.18.6 released

Today Singular.jl 0.18.6 has been released.

Diff since v0.18.5

Closed issues:

• Merge libsingular-julia into this report and set up a system where it automatically is used to replace the JLL if appropriate (#600)
• Better automatic Singular banner hiding (#611)
• Move libraryfuncdictionary.jl into a scratch space? (#638)
• Singular.LibSheafCoh.sheafCohBGG does not return correct matrix to Julia (#647)
• Add CI test for master which verifies that libsingular_julia_jll matches the C++ source tree hash (#663)

Merged pull requests:

• Merge libsingular-julia back and build it on demand (#639) (@fingolfin)
• Add nres/mres for sideal (#660) (@hannes14)
• Intmat to jl array (#661) (@ederc)
• Improve a bunch of docstrings (#662) (@fingolfin)
• CI: check that C++ sources treehash matches JLL (#665) (@fingolfin)
• Avoid generating src/libraryfuncdictionary.jl (#666) (@fingolfin)
• Improve banner hiding code (#668) (@fingolfin)
• Update libsingular_julia_jll and Singular_jll (#669) (@fingolfin)