progress on deepCopy
fixes yet another LL bug
check there is only one deepCopy per type
added debug output (but not active)
added test
Merge branch 'devel' of https://github.com/Araq/Nimrod into devel

Conflicts:
	compiler/ccgexprs.nim
fixes typos
Adds library links to two new modules.
Adds more hyperlinks, mostly to website news.txt.