1. moved boost dependency to global IRTKInclude. Boost is usually available system-wide under Linux. Not under Windows. The correct way for this dependency should be global cmake visibility and include within the project.

2. correct way to init dynamic arrays is by using new and delete[]. non constant array init works only for gcc, but not for other compilers.
adapting for VTK 6 (VTK < 6 should still work, everything flagged)
everything compiling with VTK 6 (not everything tested though -- only minor syntax changes were required)
minor for VS versions < 11 (overload problem of floor)
Merge pull request #1 from bkainz/master

boost visibility and VTK