cleanup .gitignore files

[fbergkemper]

This PR is a general clean-up of our .gitignore files.

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[arogge]

What about:
*~
*.slo
*.lo
*.o
*.pyc
*.swp
*.so
*.dylib
*.lai
*.la
*.a
autoconf/config.log
tags
cscope.out
*/Testing*/

So maybe we want a general cleanup? I also noticed we have 16 different .gitignore files. Maybe we can also try to improve the rest of the overall situation, because it seems like there are a lot of old and unneccessary ignores.

[fbergkemper]

What about: *~ *.slo *.lo *.o *.pyc *.swp *.so *.dylib *.lai *.la *.a autoconf/config.log tags cscope.out */Testing*/

So maybe we want a general cleanup? I also noticed we have 16 different .gitignore files. Maybe we can also try to improve the rest of the overall situation, because it seems like there are a lot of old and unneccessary ignores.

Good point, I'd fully agree on a general clean-up.