fix: protect error messages in float.c with locks. #772
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…tests for the error messages.
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This PR makes error handling in
float.cthread-safe by protecting error messages with locks and replacing directprintfcalls withMesPrint. It also adds tests for error paths that can be triggered from a FORM script.However, should the program terminate when encountering divergent MZVs and Euler sums, or should these cases be skipped, similar to the current behaviour for e.g. a divergent
log_?