Support reading password for non-tty stdin
call isatty once instead of twice.
clear errno after it could be set to avoid confusing errors.
io.c - minor cleanup after cherry-picks
Makefile - give up on -Werror

 * Many linux distros have warnings even in their standard header files.

 * There are also some more exotic warnings in the tcplay code when
   compiling for less common architectures (ia64, mips, sparc, ...)
add a CHANGELOG
Merge remote-tracking branch 'upstream/master'

Conflicts:
	io.c