Completion of error handling

[elfring]

Would you like to add more error handling for return values from functions like the following?

• fclose ⇒ _synctex_updater_close
• malloc ⇒ _synctex_log

[jlaurens]

I have no real option, if you think there is something missing, feel free to make more precise suggestions or add a pull request.

[elfring]

• :thinking: How do you think about to improve static source code analysis also for this software?
• :crystal_ball: How will chances evolve to benefit any more also from the means of aspect-oriented software development?

[jlaurens]

Any ways of rendering the code stronger is welcome. Maybe static code analysis can be automated at the GitHub level. About aspect oriented, I can't tell anything except that changes in the public interface should be avoided.