Added IfcPPTypeBroker to create TYPE objects efficiently. 
Fixed bug in STEP reader (tokenizing of string arguments).

git-svn-id: http://ifcplusplus.googlecode.com/svn/trunk@20 06f6d6f3-f2e0-f239-6e86-ba6a5d17d3a5
added script to set environment variables for OSG and Qt

git-svn-id: http://ifcplusplus.googlecode.com/svn/trunk@21 06f6d6f3-f2e0-f239-6e86-ba6a5d17d3a5