[feat] Detect missing files in `summary_database()`

[hongyuanjia]

Pull request overview

• Fixes #40
• Now summary_database() can append results to the previous scan and detect if any previously matched NetCDF files do not exist. It stores the metadata of those missing files as a new attribute not_found in the results. Warnings are issued if warning is set to TRUE. Also, a new parameter miss has been added to control how to manage those invalid entries. You can set it to "keep", which is the default, to do nothing about it or "overwrite" to overwrite those entries based on the newly matched NetCDF files if possible.

[codecov-commenter]

Codecov Report

Merging #44 (1efc5c5) into master (8ca4335) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #44   +/-   ##
=======================================
  Coverage   99.81%   99.82%           
=======================================
  Files           5        5           
  Lines        1084     1146   +62     
=======================================
+ Hits         1082     1144   +62     
  Misses          2        2           

Impacted Files	Coverage Δ
R/netcdf.R	99.45% <100.00%> (+0.11%)	:arrow_up:

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