[PATCH] add lzma and xz to unpack plugin

[Auke Kok]

Zbigniew Luszpinski wrote:
>> that is the logical succession of my point, however, I really thing that 
>> this move should START by making a plugin in the xz/lzma modules, not 
>> the other way around.
>>
>> stop bickering, write a plugin, it's easy, and any dev can commit it to 
>> moonbase. :P
>>
>> Auke
> 
> OK. I wrote and commited xz plugin.
> bzip2, gzip and tar also should be converted to plugins?

if there are more xz/lzma files in moonbase than bz2/gz, I'll gladly 
consider that.