fixed rebinning problem + added masking

[sebastian-brylka]

Fixed rebinning problem:

• if the bin size of coverage does not match pon's template, automatically rebin to match the pon bins
• achieved by gr.val function with pon template as query
• if the bin sizes match but the number of bins do not, stop execution

Added masking functionality

• allow user to provide a mask so that some regions of the coverage do not get drycleaned
• if use.blacklist = TRUE but blacklist.path remains unspecified, applied a default mask
• mask both coverage and pon before the drycleaning to match dimensions
• if the mask was applied, clean function returns the coverage of the same ranges as the original coverage but all the values in the masked regions are set to NA

[codecov]

Codecov Report

Merging #23 (6cd8f9b) into master (ce4d204) will decrease coverage by 7.43%.
Report is 3 commits behind head on master.
The diff coverage is 26.92%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #23      +/-   ##
==========================================
- Coverage   86.34%   78.91%   -7.43%     
==========================================
  Files           3        3              
  Lines         520      555      +35     
==========================================
- Hits          449      438      -11     
- Misses         71      117      +46     

Files	Coverage Δ
R/helper_functions.R	75.00% <25.00%> (ø)
R/dryclean.R	77.74% <27.02%> (-10.74%)	⬇️

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