Enabled sorting of BBv2 modules into subdirectories

build-system.jam - moved from tools/build/new to tools/build

boost-build.jam - moved from tools/build/new to tools/build/kernel
bootstrap.jam
errors.jam
modules.jam

test/BoostBuild.py   - adjusted for the above modification
test/boost-build.jam

project-root.jam - renamed to "project-roots.jam" to avoid confusion
                   and conflict with the user's project-root.jam file

project.jam                           - adjusted for the above renaming
test/project-test1/project-test1.jam

type.jam - broke a circular module dependency


[SVN r18575]

tools/build

@@ -1 +1 @@
-Subproject commit 7035a065abe0ce45456a8f1729c945c8e0ed2925
+Subproject commit d9d8785236a29b5c87eec0cbc9fc3dd9a5cdaefc