Coverity issues

[375gnu]

Hi!

I've scanned the latest Celestia code using Coverity tool and it has found 182 issues.

Scan results can be found here

I'll try to fix them.

[Alexell]

@375gnu Coverity does not allow viewing on your link (at least without authorization). But I'm aware of the presence of unfinished places in the code. I would be grateful if you could help me finish them.

[Alexell]

On our forum there are a lot of messages about Celestia QT bugs, but I do not have enough time to go to the forum yet.

[375gnu]

Indeed, it requires authentication. I've sent you an invitation. https://scan.coverity.com/projects/celestia.

I'm not familiar with QT, 3D and astronomic programming, but I like Celestia so I just do what I can.

[CelestiaProject]

@375gnu Please check the successful Celestia compilation and correct work after your changes before sending pull requests. Thank you.

[375gnu]

fixed in master