New content hashes and default file names

[adbar]

TODO:

• content to be hashed: title & main text
• better string tokenization
• clean up

[codecov-commenter]

Codecov Report

Merging #314 (915a7c0) into master (55237a7) will increase coverage by 0.06%.
The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##           master     #314      +/-   ##
==========================================
+ Coverage   96.35%   96.42%   +0.06%     
==========================================
  Files          21       22       +1     
  Lines        3268     3329      +61     
==========================================
+ Hits         3149     3210      +61     
  Misses        119      119              

Impacted Files	Coverage Δ
trafilatura/filters.py	97.26% <ø> (-0.28%)	⬇️
trafilatura/cli.py	94.73% <100.00%> (+0.03%)	⬆️
trafilatura/cli_utils.py	90.24% <100.00%> (-0.10%)	⬇️
trafilatura/core.py	98.10% <100.00%> (+<0.01%)	⬆️
trafilatura/hashing.py	100.00% <100.00%> (ø)
trafilatura/meta.py	100.00% <100.00%> (ø)

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