New function merge_camtrapdp()

[sannegovaert]

fix #75

Remarks

• Assume that locationID's and individualID's must not be unique as the same location or individual can be used in different data packages.
• Assume that duplicatesd ID's are between packages, not within.
• If duplicates are present, all values of that identifier get a prefix.

Helper functions
I created 6 helper functions. Maybe they can be simplified or reduced in number!
They now live at utils.R.

function	functionality in merge_camtrapdp()	suggestion
check_duplicate_ids()	add prefix to identifiers with duplicates	helper function @ utils.R
add_prefix()	add prefix to identifiers with duplicates	helper function @ utils.R
normalize_list()	remove duplicated elements of lists	helper function @ utils.R or separate file.R
is_subset()	remove duplicated elements of lists	helper function @ utils.R or separate file.R
update_unique()	remove duplicated elements of lists	helper function @ utils.R or separate file.R
remove_duplicates()	remove duplicated elements of lists	helper function @ utils.R or separate file.R

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.91%. Comparing base (8c4981e) to head (74983fd).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #112      +/-   ##
==========================================
+ Coverage   99.89%   99.91%   +0.01%     
==========================================
  Files          22       23       +1     
  Lines         958     1148     +190     
==========================================
+ Hits          957     1147     +190     
  Misses          1        1              

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