Draft templates for sl6.x-x86_64

Here are package list templates generated from the SL6x comps.xml file for the Yum based SPMA.

Apart from not having the package versions and architectures, the main differences are:

- the 4 package levels are kept separate
- the "mandatory" level is used as default
- the language support templates are also separated
- the "conditional" level has conditional statements

Also if someone has a better syntax for the "conditional" templates, please let me know.