add == and < instance for ()

Closes #1

See merge request clean-compiler-and-rts/stdenv!1

Revert "temporarily add fields gcd_strict_arguments to record GenericConsDescriptor and grd_strict_fields to record GenericRecordDescriptor of module StdGeneric"

This reverts commit 0d9308cf.

temporarily add fields gcd_strict_arguments to record GenericConsDescriptor and grd_strict_fields to record GenericRecordDescriptor of module StdGeneric

use n>>1 instead of n/2

add member types with strictness annotations to {!} and {#} instances (the compiler currently adds these annotations)

remove bracket count in _eval_to_nf