Deprecating allow_ignore in favor of ignore_errors

[germa89]

While working on #1664

I saw that ignore_errors does nothing, in fact it is redundant with allow_ignore. The later is more common, but I believe the naming is not the best.

So I am redirecting allow_ignore to ignore_errors and issuing a Deprecation warning when allow_ignore is used or set.

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[codecov]

Codecov Report

Merging #1743 (2e30705) into main (326b802) will decrease coverage by 4.14%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1743      +/-   ##
==========================================
- Coverage   85.57%   81.42%   -4.15%     
==========================================
  Files          45       45              
  Lines        7630     7660      +30     
==========================================
- Hits         6529     6237     -292     
- Misses       1101     1423     +322