merged in forest logging for analysis.
Update of some references.
Removed a debugging statement and changed a printf to quiet the C compiler.
Added some reformatting and documentation.
find_n/4.
Fixed spelling in error message.
Seems to have become inconisistent with .P file. So just check it in.
Seems to have become nconsistent with .P file? So just checking it in.
Fixes for accessing subg-visitors on 32-bit linux.
Fix for mark cyclic on 32-bit linux (will check on mac)
