Fix nastran-specific float to string conversion#1519
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function
meshio.nastran._nastran._float_to_nastran_stringthrows an error for negative floating point numbers like, e.g.,-1.12345678901as the additional neg. sign causes a violation of the assert statement (line 416).This leads to an error when exporting a mesh in Nastran format.
The problem can be circumvented by reducing the precision for negative floating-point numbers.