Polymake.jl 0.5.8 released

Today Polymake.jl 0.5.8 has been released.

Diff since v0.5.7

Closed issues:

• Copy for BigObjects not working (#341)

Merged pull requests:

• Combine incidencematrix (#356) (@alexej-jordan)
• lp2poly: pre-load LPparser during init (#357) (@benlorenz)
• bump version to 0.5.8 (#358) (@benlorenz)
• deepcopy -> deepcopy_internal (#359) (@benlorenz)
• add config to script runner and add 4ti2 configuration (#360) (@benlorenz)
• add scope for prefer and fix bigobject copy (#361) (@benlorenz)
• tests for graphs and multiple subobjects (#362) (@benlorenz)