Added fswap.eps and fswap.gif to eps.zip and gif.zip
Reformulated the placement new operator section
Repaired multiple typos and stuff, WIP on ch. 23
Reformulated nested friends handling and added (r)begin/end members to string
Processed Francesco's feedback for ch. 22
Repaired multiple typos
Processed Francesco's remarks until Ch. 21 (22 next)
Avoiding extra blank before ti(...) macros
removed the parameter pack requirement fm perfect forwarding