Module variables with '_' in their name are not exporting correctly from export dialog.

[jhs507]

Module variables are not exporting any values when selected in the export dialog.

Reported in User Assessment #385

[jhs507]

Issue is due to ExportDlg::PrepareDataForExport() using the presence or lack of presence of a _ character in the output name to determine if it has a suffix or not. This is insufficient because there are variables with the _ character.

[jhs507]

Closed with 7ffa354