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characters '. ", <, > and &

Conflicts:
	examples/verifythis_2015_relaxed_prefix/why3session.xml
	examples/verifythis_2015_relaxed_prefix/why3shapes.gz

in comments for the moment, until I find time to prove it

this is of course unsafe, yet useful if you have proved absence of
overflows independently or if you are happy with a partial correctness
proof (that is, if there is no overflow then the postcondition holds)

this is work in progress; nothing plugged in yet