Change to header specs

[Willy Tschager]

Dear LSB,

please discuss and vote the following change to the Official Library Header Specification:

Appendix VI
Programs relying on the parts.lst file rather then the LDRAW_ORG meta-statement use special characters to prevent the parts being included in the list:

- the descriptions of all subparts (i.e. line 4 = '0 !LDRAW_ORG Subpart') must start with '~'
- the description of all obsolete parts, maintained for backwards compatibility must start with '~'
- the descriptions of all aliases (i.e. line 4 = '0 !LDRAW_ORG Part Alias') must start with '='
- the descriptions of all physical colour parts (i.e. line 4 = '0 !LDRAW_ORG Part Physical_Colour') should start with '_'

The use of '~' for part files is at the author's discretion, to hide mouldings that are not released independently. This is one case where merely reading the LDRAW_ORG line is insufficient for tools to know how to treat the file.

Thx, w.