Overwrites database name when importing a database

[shermanl]

When you import a database, and select a model. The output file name will default to overwrite file any existing file name. This should be corrected.

Reproduce:

• Have previous default EwE6 database open. (has to be imported from EwE5)
• Open Ewe5 database again, and select model
• By default, it will overwrite existing file name without prompting.

Solution:
Ask for simple prompt if you want to overwrite database.

[administrator]

related to #24
related to #17

[user8]

IT is being addd now..BY fang..

[user8]

Functionality implemented..

[jeroens]

Albeit correct, the prompt has displayed in an untraditional manner. It appeared in three places:

1. when the wizard page loaded
2. after the user has finished changing the output file name
3. after the user closed the file browse dialog

Instead, the output destination is checked only once when the page is validating.
Additionally the existence of the output folder is checked.