Support adding an individual extension string to the manager.

git-svn-id: https://lunarglass.googlecode.com/svn/trunk@1054 ef8e4060-2eb2-c653-76b5-35368577a8d7
Top Builder: Allow control of the user of the builder to say whether or not extra blocks are inserted for potential dead code after a branch.


git-svn-id: https://lunarglass.googlecode.com/svn/trunk@1055 ef8e4060-2eb2-c653-76b5-35368577a8d7