JuliaHomotopyContinuation/HomotopyContinuation.jl: v0.6.0

This is quite a big release:

• Support for multi-homogeneous homotopies and total degree homotopies (#190)
• Improvement in the robustness of monodromy (#193)
• Newton's method is now also accessible as a standalone routine (#191)
• Monodromy with group actions only keeps track of one representative (#195)
• The path tracker can now also track in affine space rather than in projective space (#202). During affine scaling we automatically scale the variables (#203).
• The options to PathTracker have been renamed. The old ones are deprecated.