Compiler warnings on Mac.
Let's do error handling with a message.
Error handling in data structures.
Update ptrtable tests.
Rewrite stringtable tests.
Object tests compile, but don't pass yet.

Because I'm not actually done writing them, yet.
Actually clean everything!
Populate error messages in object.c.
Error handling in runtime and symboltable.
Update runtime and symboltable tests.
Temporary workaround for errors not displaying.
Include the line number in seg_errors.
seg_integer storage and retrieval.