Improved resource releasing#71

Merged

simogasp merged 12 commits intodevelopfrom

Feb 25, 2020

Commits on Feb 4, 2020

Commits on Feb 9, 2020

[popsift] using unique_ptr instead of raw pointer for threads
simogasp
committed

Commits on Feb 24, 2020

[popsift] remove redundant 0-initialization
Carsten Griwodz
committed