SYMROOT is now ../build rather than ../../build
SYMROOT is now ../build rather than ../../build

This is a big change but will allow us to intermix complex,
multi-component projects with invidividual component projects.
The comments included in this commit describe the kind of project layout
that is intended to work well with this setting.

Signed-off-by: Wincent Colaiuta <c76ac2e9cd86441713c7dfae92c451f3e6d17fdc@wincent.com>

wincent/buildtools,wincent/buildtools,wincent/buildtools