Created attachment 2756 [details]
bake patch for contrib support

This patch, largely due to Ankit Deepak, introduces a few changes to bake to support ns-3 contributed modules:

1) allow modules to be defined in bakeconf.xml or alternatively in XML files in a contrib/ directory

2) some new list options to allow users to list enabled and configured modules

3) ability to incrementally 'enable', 'disable', or 'clean' the list of modules to be downloaded/built

4) define a new type of 'ns-contrib' module that allows the module to be associated with valid versions of an ns-3 module (e.g. ns-contrib module is valid for ns-3 version 3.26 or greater)