Structure that describes Combined tolerance format.
for member m_iType:
1: Numerical side by side,
2: Numerical super-imposed,
3: Resolved numerical side by side,
4: Resolved numerical super-imposed,
5: Alphanumerical single value,
6: Alphanumerical side by side,
7: Alphanumerical super-imposed.
for member m_dSymbolH: Ratio between separator character and value text font sizes