Add vector intrinsics for AVX512 and fix issue with Intel 2018

Codecov Report

No coverage uploaded for pull request base (develop@b7e3335). Click here to learn what that means. The diff coverage is 100%.

@@            Coverage Diff             @@
##             develop     #225   +/-   ##
==========================================
  Coverage           ?   65.22%           
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  Files              ?      573           
  Lines              ?   146478           
  Branches           ?        0           
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  Hits               ?    95539           
  Misses             ?    50939           
  Partials           ?        0

Impacted Files	Coverage Δ
src/states/density.F90	53.1% <ø> (ø)
src/system/current.F90	48.05% <100%> (ø)

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changed milestone to %8.0

merged

mentioned in commit 7a7c36f9