Allow defining backup extension list (RM #1534)

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Issue migrated from Redmine: https://redmine.postgresql.org/issues/1534 Originally created by Thom Brown at 2016-08-05 22:37:57 UTC.

When looking for a backup, it initially only looks for files with the extension .backup. If a company, say, names all backups .custom, to indicate it's been backed up in custom format, then it's necessary to select "All Files" from the Format drop-down box. It would be useful to define what the list of backup extensions are, and if only one extension can be selected at a time, the order in the defined list is represented in what is selected first in the Format drop-down box.

So, for example, the aforementioned hypothetical company may wish to have "custom,backup,sql,plain" as their list, which would ideally show all files with any of those extensions, at the same time, or initially show all files ending in .custom.

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Comment migrated from Redmine: https://redmine.postgresql.org/issues/1534#note-1 Originally created by Thom Brown at 2016-08-05 22:39:11 UTC.

This was supposed to be a feature request, and not a bug, but I don't have rights to change the classification.

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Comment migrated from Redmine: https://redmine.postgresql.org/issues/1534#note-2 Originally created by Dave Page at 2016-08-08 08:53:21 UTC.

Redmine ticket header update:

Name	Old Value	New Value
Tracker changed	Bug	Feature

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Comment migrated from Redmine: https://redmine.postgresql.org/issues/1534#note-3 Originally created by Akshay Joshi at 2018-04-13 10:53:11 UTC.

Redmine ticket header update:

Name	Old Value	New Value
Sprint changed		Ready

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Comment migrated from Redmine: https://redmine.postgresql.org/issues/1534#note-4 Originally created by Khushboo Vashi at 2021-05-14 11:22:40 UTC.

Redmine ticket header update:

Name	Old Value	New Value
Difficulty changed		Easy