[ENH] make dss_line() faster

[nbara]

• add blocksize parameter to dss_line()
• matmul3d works with 2d data

[codecov]

Codecov Report

Merging #57 (216fffc) into master (7f8192a) will decrease coverage by 0.01%.
The diff coverage is 94.54%.

@@            Coverage Diff             @@
##           master      #57      +/-   ##
==========================================
- Coverage   78.75%   78.73%   -0.02%     
==========================================
  Files          21       21              
  Lines        2306     2314       +8     
==========================================
+ Hits         1816     1822       +6     
- Misses        490      492       +2     

Impacted Files	Coverage Δ
meegkit/utils/__init__.py	100.00% <ø> (ø)
meegkit/utils/matrix.py	82.69% <80.00%> (-0.46%)	⬇️
meegkit/dss.py	90.20% <96.15%> (+0.28%)	⬆️
meegkit/detrend.py	90.27% <100.00%> (+0.13%)	⬆️
meegkit/tspca.py	64.38% <100.00%> (-0.49%)	⬇️
meegkit/utils/denoise.py	76.00% <100.00%> (+0.19%)	⬆️
meegkit/utils/sig.py	57.83% <100.00%> (-0.46%)	⬇️

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