Wrapper fixes

[sergiomb2]

• 315f146 Automatically generate symlinks for patchview-wrapper

  Instead of including them directly in the source code, this commit
  generates symlinks for gitdiff, gitdiffview, gitshow, gitshowview,
  svndiff, and svndiffview automatically via Makefile.am.

  Add install-exec-hook and uninstall-local to manage the symlinks,
  using loops to automatically create/remove them and avoid repetition
  of individual ln -sf and rm -f commands.

• 50b6ec5 With view we always use filterdiff, even if we don’t have any arguments.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.50%. Comparing base (9930b59) to head (315f146).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #145   +/-   ##
=======================================
  Coverage   83.50%   83.50%           
=======================================
  Files           5        5           
  Lines        4159     4159           
  Branches      985      985           
=======================================
  Hits         3473     3473           
  Misses        686      686           

Flag	Coverage Δ
unittests	83.50% <ø> (ø)

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