Changes made for Pathfinder V5 PC's.

Write fix (MachineProfileDAC.cs:47) — uses Convert.ToString(valueToUpdate, CultureInfo.InvariantCulture) so floats are always saved with a period decimal separator, regardless of the Windows locale.

Read fix (DatabaseLoadManager.cs:169) — if a stored value has a comma but no period (indicating it was saved on a comma-decimal locale), it replaces the comma with a period before parsing. This silently heals corrupted SDF files — the next time the value is saved back, it'll be written correctly