Full stack error propagation

[ezorita]

Description

Propagate errors in the code so that when the program crashes, the full stack of function calls is printed with a (optional) description message.

Subtasks

• Define error macros.
• Unify failure_return tags.
• Update current code.

Acceptance criteria

• All errors can be tracked.
• All internal calls between library functions have error check and propagation.

Test procedures

It's difficult to unit test error propagation. A possibility is to check that the correct amount of lines (call stack) are written to stderr.