[v3] Some fixes to exception safety testing

[Paolo Carlini]

Hi,

this started when I wanted to remove two xfails, because indeed
vector::erase and deque::erase *can* throw if either copy constructor or
assignment operator throws. Along the way, I noticed other issues,
detailed in the ChangeLog, quite basic in retrospect, but a nightmare to
debug out with the gdb 6.8 setup I have at hand... grrrr

Anyway, tested x86_64-linux multilib, committed.

Paolo.

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