Madokami - option to keep original file names

[pierobot]

Whenever I use cum get to download individual or all archives for a manga, the volume number gets stripped from the file name.

This will also help in cases like Shamo, which had two publishers.
The second publisher chose to restart the chapter numbers.
To keep the natural sort working, the filenames on Madokami use d instead of c before the chapter numbers like so: Shamo - d001-008 (v20) [m-s & wfp].zip

Problem is, cum downloads result in the following:

Shamo - c000 [d001-008 v20 [m-s ] [Unknown].zip
Shamo - c000 [d009-017 v21 [m-s ] [Unknown].zip
Shamo - c000 [d018-026 v22 [m-s ] [Unknown].zip
Shamo - c000 [d027-035 v23 [m-s ] [Unknown].zip
Shamo - c000 [d036-044 v24] [WFP].zip
Shamo - c000 [d045-053 v25] [WFP].zip
Shamo - c000 [d054-062 v26] [Illuminati-Manga].zip
Shamo - c000 [d063-071 v27] [Illuminati-Manga].zip
Shamo - c000 [d072-080 v28] [Illuminati-Manga].zip
Shamo - c000 [d081-089 v29] [Illuminati-Manga].zip
Shamo - c000 [d090-098 v30] [Illuminati-Manga].zip
Shamo - c000 [d099-107 v31] [Illuminati-Manga].zip
Shamo - c000 [d108-116 v32] [Illuminati-Manga].zip
Shamo - c000 [d117-125 v33] [wfp].zip
Shamo - c000 [d126-134 v34] [wfp].zip
Shamo - c001-010 [m-s].zip
Shamo - c011-020 [m-s].zip
Shamo - c021-030 [m-s].zip
Shamo - c031-040 [m-s].zip
Shamo - c041-050 [m-s].zip
Shamo - c051-060 [m-s].zip
Shamo - c061-070 [m-s].zip
Shamo - c071-080 [m-s].zip
Shamo - c081-090 [m-s].zip
Shamo - c091-100 [m-s].zip
Shamo - c101-110 [m-s].zip
Shamo - c111-120 [m-s].zip
Shamo - c121-131 [m-s].zip
Shamo - c132-142 [m-s].zip
Shamo - c143-153 [m-s].zip
Shamo - c154-164 [m-s].zip
Shamo - c165-177 [m-s].zip
Shamo - c178-188 [m-s].zip
Shamo - c189-200 [m-s].zip

I think adding an additional config value for Madokami madokami.keep_original_names might be a good idea.