Fix number of generated SIFT features#28

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stotko wants to merge 2 commits intoniessner:masterfrom

stotko:sift_fixes

Commits on Oct 16, 2018

Fix wrong key point limit check and clamp the number of features in the last contributing level
stotko
committed
Replace hard-coded max number of features for SiftGPU with the global one and adjust it in the config file to preserve current behavior
stotko
committed