Eliminate the use of writeToString for condition creation

[ehuelsmann]

Due to the fact that the object being written may be recursive, we need to bind *print-level* and *print-circle* before writing objects to error strings. Possibly, these instances can be replaced by a format string and format arguments.

[ehuelsmann]

Although this is especially an issue when printing Cons objects, not using writeToString doesn't seem like an option right now. Closing as 'invalid' because there's no alternative.