Somewhat more sane choice of directory. Fix problem where winscw migh have had wrong TARGETEXT var.

correct comments.

Better release notes.

fix releasenotes

notes about tcomsupport update

fix: support new trace compiler features for preventing clashes. Automatically turn on OST_TRACE_COMPILER_IN_USE macro. Look for trace header in systemincludes. Make directories in makefile parse to prevent clashes during build. Correct path for autogen headers. Correct case issue with autogen headers on Linux.