2004/07/20 19:09:04 thb 1.2.2.3: #110496# Unified include statements; removed external prefix from boost includes
2004/06/25 10:30:29 thb 1.2.2.2: #110496# Some header cleanups (missing forward declarations), changed Canvas and derived to emulate covariant return types on clone() (not directly possible with shared_ptr)
2004/04/05 15:58:52 thb 1.2.2.1: Resync with canvas01 changes