[BackupScreen] Errors from non-existent files

[prl]

The old implementation of BackupScreen removed non-existent files too early. The current implementation tries to back up all paths in config.plugins.configurationbackup.backupdirs, even if they don't exist, resulting in unnecessary error messages.

[Peter Urbanec]

Fix Bug #601: [BackupScreen] Errors from non-existent files

"glob" the paths in config.plugins.configurationbackup.backupdirs and eliminate non-existant files from the list of files to be backed up.

Filenames containing whitespace and other non-glob shell special characters will now also be corectly handled (except in now-unused self.backupdirs).

The command now no longer needs to be run via a shell invocation, so use the exec() form of Console execution instead of the system() style.

Retain self.backupdirs as a space-separated list of file paths for backward compatibility.

→ <<cset 9fda5bebb2c9>>

[Peter Urbanec]

Merged in prl/easy-ui-4/Fix-bug-601 (pull request #375)

Fix Bug #601: [BackupScreen] Errors from non-existent files

→ <<cset 3dc7d7da3997>>