Use new GlobalPrintConfig also when setting engineering float formatter.
Before, the following global variables in pandas.core.common were used to store print options:
- _float_format
- _column_space
- _precision
- _max_rows
- _max_columns

Now these are stored in pandas.core.common.GlobalPrintConfig, when setting the engineering float formatter it should alter GlobalPrintConfig and not the above variables (which i commented out by the way sine i think they are no longer used). Otherwise it has no effect.
