Fixed wrong behavior if some GPUs are occupied by other processes

Cuda visible devices logic fix #12 (#13)

* Fixed an error regarding ebsence of CUDA_VISIBLE_DEVICES

* Fixed values in array with occupied devices

Lamda function tasks

Calculations count function (#11)

* Very useful function to calculate sizes of a data chunks

* Increased cpp standard to 14

Increased cpp standard

Calculations count function (#11)

* Very useful function to calculate sizes of a data chunks

* Increased cpp standard to 14

Function to calculate data chuck sizes

v0.8.1

Very useful function to calculate sizes of a data chunks (#10)

Optional signal handling, LambdaGPUTask

v0.8.0

Seg fault handler

v0.7.0

Correct treatment of CUDA_VISIBLE_DEVICES

0.5.0

CUDA_VISIBLE_DEVICES support. More convenient API.

v0.4.0

Conan support

v0.3.0