File-roller should support .7z password protection.

The 7z format is able to add a password protection to a file.
You need the lib p7zip to use the 7z format with file-roller.

Use the following command in a concole to compress a file:
7z a -t7z -p archive.7z filename.ext

Use the following command to extract this same file:
7z e archive.7z
The password is then asked to the user.


When extracting a .7z file that is password protected, a popup window should come up asking the user to enter the password.

Here is a mock up of this pop up window:

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<!>This archive is password protected.

Please enter the password:
-----------
|         |
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<Ok>   <Cancel>
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