Merged in grbd/scons (pull request #496)

diff --cc src/CHANGES.txt
index a5bfa312e057c2ead4fbc6e9da2c948f536b33aa,e875a01ed6387c0760983aa22b85a072b569ceba..430c9bf328ca3575d3590aeb51a7f88ba99c9bce
--- 1/src/CHANGES.txt
--- 2/src/CHANGES.txt
+++ b/src/CHANGES.txt
@@@ -81,12 -88,6 +81,13 @@@ may cause rebuilds.  In no case should 
      - Fixed PCHPDBFLAGS causing a deprecation warning on MSVC v8 and later when
        using PCHs and PDBs together.
  
 +  From Richard West:
 +    - Added nested / namespace tool support
 +    - Added a small fix to the python3 tool loader when loading a tool as a package
 +    - Added additional documentation to the user manual on using toolpaths with the environment
 +      This includes the use of sys.path to search for tools installed via pip or package managers
++    - Added support for a PyPackageDir function for use with the toolpath
 +
    From Russel Winder:
      - Reordered the default D tools from "dmd, gdc, ldc" to "dmd, ldc, gdc".
      - Add a ProgramAllAtOnce builder to the dmd, ldc, and gdc tools. (PR #448)