Remove some superfluous executable bits

[junghans]

chmod -x AUTHORS ChangeLog COPYING INSTALL NEWS README

There are a couple more in the source, these are the ones rpmlint is complaining about.

[codecov]

Codecov Report

Merging #2242 into python will increase coverage by <1%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           python   #2242    +/-   ##
=======================================
+ Coverage      71%     71%   +<1%     
=======================================
  Files         377     377            
  Lines       18941   18941            
=======================================
+ Hits        13560   13580    +20     
+ Misses       5381    5361    -20

Impacted Files	Coverage Δ
src/core/layered.cpp	79% <0%> (ø)	⬆️
src/core/domain_decomposition.cpp	91% <0%> (+3%)	⬆️
src/core/lattice.cpp	89% <0%> (+6%)	⬆️

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[hmenke]

There are a couple more in the source

I think its okay to just remove all of them (except the ones on actual executables of course).

[hmenke]

I have now removed the executable bit from all files which do not start with a shebang #! and added a shebang in two places where it seems appropriate that the file remains executable.

[junghans]

LGTM, thanks!