Remove FILE_SUFFIX from DirListCSV task?

[pjotrek-b]

Currently, the file suffix of the listings created during the DirListCSV task is hard-coded:

cinbox/src/lib/CInbox/Task/TaskDirListCSV.php

Line 53 in b393397

const FILE_SUFFIX = 'csv';

I think this is not really helpful, and it'd be better to take the "DIRLIST_FILE" argument /as-is/, instead of requiring another constant and concat, like it is now:

cinbox/src/lib/CInbox/Task/TaskDirListCSV.php

Line 100 in b393397

$fileName = $this->dirListFile .'.'. self::FILE_SUFFIX;

NOTE: Changing this would break backwards compatibility with existing cinbox.ini files!
Trivial, but still incompatible.