Silence a pylint warning about _git_rev

Was deprecated in islpy!13.

Expunge across_dim_types from isl align_foo calls

Closes #198

See merge request !352

Fix incompatibility with pymbolic diff mapper changes

See merge request !356

- types would now correspond to those defined in inttypes
- ExecutableCTarget derives from C99 as well

- C(Target, ASTBuilder) -> CFamily(Target, ASTBuilder)
- C99(Target, ASTBuilder) -> C(Target, ASTBuilder)

Use types provided by inttypes in CTarget

See merge request !357

Fix wrinkles

See merge request !358

Run Azure pylint job on Py37

Better Access Check Mapper failure message

Closes #204

See merge request inducer/loopy!361