OpenOfficeType mapping

[oscargus]

The mapping between type numbers are types are as follow (based on latest LibreOffice):

0 Article
1 Book
2 Brochures
3 Conference proceedings
4 Book excerpt
5 Book excerpt with title
6 Conference proceedings
7 Journal
8 Technical documentation
9 Thesis
10 Miscellaneous
11 Dissertation
12 Conference proceedings
13 Research report
14 Unpublished
15 E-mail
16 WWW document
17 User-defined 1
18 User-defined 2
19 User-defined 3
20 User-defined 4
21 User-defined 5

This doesn't really follow:
https://github.com/JabRef/jabref/blob/master/src/main/java/net/sf/jabref/logic/layout/format/GetOpenOfficeType.java
so at one stage it would be nice to improve this mapping. The three "Conference proceedings" make it interesting, but maybe one can find more information...