support for symbolic link in some file functions

[paulocoutinhox]

No description provided.

[codecov-commenter]

Codecov Report

Merging #5 (082e155) into main (b352f75) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main        #5   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           12        12           
  Lines          599       599           
=========================================
  Hits           599       599           

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

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Impacted Files	Coverage Δ
pygemstones/__init__.py	100.00% <100.00%> (ø)
pygemstones/io/file.py	100.00% <100.00%> (ø)

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