#9660 LOW 1.5-F11: clean up build system

[Zarro Boogs per Child]

#9660: clean up build system
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 Reporter:  dsd           |                 Owner:  dsd      
     Type:  task          |                Status:  new      
 Priority:  low           |             Milestone:  1.5-F11  
Component:  build-system  |               Version:           
 Keywords:                |           Next_action:  never set
 Verified:  0             |   Deployment_affected:           
Blockedby:                |              Blocking:           
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 Build system is getting a bit messy. If time allows, it would be worth
 spending 1/2 - 1 day on cleaning this up. As this is likely to be used by
 deployments, separating out the bits that people would usually want to
 tweak will have value too. And some documentation wouldn't go amiss. For
 really easy deployment it wouldn't hurt to make this into a fedora package
 too. (yum install olpc-image-builder ?)

 The XO-1 and XO-1.5 stuff could both be in the same branch, but the
 important differences split in different "hardware profiles" in some form.
 The activities could be configured separately in their own file.

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Ticket URL: <http://dev.laptop.org/ticket/9660>
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