v4.16.0

Compat v4.16.0

Diff since v4.15.0

Merged pull requests:

• Explain the compat workflow for functions (#827) (@gdalle)
• Add Fix{N} for fixing a single positional argument at any position (#829) (@MilesCranmer)
• Add insertdims (#830) (@mcabbott)

Closed issues:

• Add Fix{N} utility for fixing an argument (#828)