Merge pull request v923z#458 from v923z/sum-fix

Sum fix

Merge pull request v923z#453 from RobertoRoos/release/v1.7

Adding branch release/v1.7 to suit version 1.7.9

Merge pull request v923z#452 from RobertoRoos/release/v0.54

Adding branch release/v0.54 to suit version 0.54.6

Merge pull request v923z#451 from RobertoRoos/release/v0.36

Adding branch release/v0.36 to suit version 0.36.1

Merge pull request v923z#428 from v923z/fix-4d

fix sum for 4D arrays

Merge pull request v923z#408 from v923z/attr-prop

implement ndarray properties

Merge pull request v923z#388 from v923z/gc-fix

fix garbage collection problem

move release pointer

increment version number

updated version number