Smarter access range finding

See merge request inducer/loopy!230

Fix indirect dep edge cache in var order checking (#127 on gitlab)

See merge request !227

Fix some of the examples

See merge request !224

Add check for variable ordering and language versioning scheme

See merge request !223

check_variable_access_ordered: Do not enforce ordering for aliasing-based relationships in different groups

move ccomp out of kwarg default

See merge request !226