0.21.10

Added

• New math functions: f16.erf, f32.erf, f64.erf.

• New math functions: f16.erfc, f32.erfc, f64.erfc.

• New math functions: f16.cbrt, f32.cbrt, f64.cbrt.

Fixed

• Variables being indexed now have correct source spans in AST.

• futhark lsps hover information now contains proper range information.

• futhark query and futhark lsp incorrectly thought size
  parameters had type i32.

• futhark doc put documentation for prelude modules in the wrong
  location (which also led to messed-up style sheets).