WIP towards 9.1.0
Processed 1st e-mail by Steve Andrews
friend decl. as fwd decl. (Visciano Nunzio)
Re-included strdupnew's implementation (Marcel Mettes)
Repaired typos mentioned by Stephen Weber
typo
Added a reference to the ios header file to iostreams/headers.yo
changed subsubsection to subsubsect
Sourceforge files edited and minor tweaks