API change: FileSet categories changed to an enum
Set build type option per platform
API change: workspace_dir -> build_dir
Allow building release and debug variants separately
qt: use namke when jom is not available

+ use new function for determining VC version year
Use formula option for boost libraries option
API change: add_deps now takes variable args
Remove suffix from tcl and tk

This will allow cmake to find them automatically
boost: fix options and build more libraries

+ make sure the right architecture is used

Evidently, --with-libraries doesn't work the way I thought, so use
--with-library instead. Now build chrono, date_time, and iostreams
as well.
coin: upgrade to 4.0.0a (HEAD)
soqt: upgrade to 1.6.0a (HEAD)
New formula: swig
New formula: pivy
New formula: flann
New formula: qhull
New formula: pcl
python: Lib needs be specified as destination

Top-level folders can only be overwriten if specified as the destination