Completion of error handling

[elfring]

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

• fseek ⇒ bmh_partial
• ftell ⇒ bmh

[eriknyquist]

Good catch, I'll fix that

[eriknyquist]

Fixed
cae348f

[eriknyquist]

Don't mind the red "x" from CI next to the new commits, the osx jobs on travis aren't running right now (high load I assume) so I've been cancelling them to run on the next commit. If you click into the details you see everything passed except the osx env.

[elfring]

• How do you think about to improve static source code analysis also for your software?

• Are you interested to apply aspect-oriented software development?

  How do you think about to encapsulate error detection and corresponding exception handling as a reusable aspect in your software?