Update tools.py

Starting from compute capability 3.0, up to 64 warps can fit on a SM.

CI: Stop targeting specific Py3 versions

See merge request inducer/pycuda!15

allow other threads to run during device init() and make_context() since those...

See merge request !14

allow other threads to run during device init() and make_context() since those calls can take hundreds of milliseconds

Allow setup_requires numpy with updated aksetup

See merge request inducer/pycuda!13

Bump CIs to Py3.6, add Titan V job

See merge request inducer/pycuda!12

replaced deprecated numpy.random.random_integers with randint

Fix two test failures with CUDA 9.2 on Windows

fix docs typo

fix to make device_allocation.as_buffer() result writable

Previously the same fix has been applied to pointer_holder_base.as_buffer but not for device_allocation class

Fix documentation related to stop_profiler method.