added wenland c8 kernel + bugfixes

[LudwigBoess]

No description provided.

[codecov]

Codecov Report

Merging #6 (341b433) into master (36c5441) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master        #6   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines          163       229   +66     
=========================================
+ Hits           163       229   +66     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

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Impacted Files	Coverage Δ
src/SPHKernels.jl	100.00% <ø> (ø)
src/bsplines.jl	100.00% <100.00%> (ø)
src/wendland.jl	100.00% <100.00%> (ø)

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