added signal_to_noise_threshold option to remove_noise function

[StSchulze]

• allows to define a signal_to_noise_threshold when using the remove_noise function
• default behavior is the same as before, i.e. the noise level can be defined either directly (key word noise_level) or by estimating the noise level after defining a mode for this, and default S/N threshold is 1.0
• merged handling of specs without binary tags

[codecov[bot]]

Codecov Report

Merging #198 into dev will increase coverage by 0.08%. The diff coverage is 95.45%.

@@            Coverage Diff             @@
##              dev     #198      +/-   ##
==========================================
+ Coverage   79.79%   79.88%   +0.08%     
==========================================
  Files          33       33              
  Lines        3930     3947      +17     
==========================================
+ Hits         3136     3153      +17     
  Misses        794      794

Impacted Files	Coverage Δ
tests/main_spec_test.py	99.02% <100%> (+0.04%)	:arrow_up:
pymzml/spec.py	75.1% <85.71%> (+0.06%)	:arrow_up:

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