Release version V0.6.4

Remove leading/trailing underscores from FASTOR macros

Fastor V0.6.2

Minor change in lu tests

Fix casting issue

Decativate automatic fma detection from avx2

Use the same abstract constructor for TensorMap that is used for tensors

Update README.md

Update README

Fix SP/DP bug in matmul. Introducde DNDEBUG flags in backend benchmar…

…k Makefile