accept either "mgiza" or "mgizapp" and either "snt2cooc.out" or "snt2cooc"

Fixed a mismatch between the wiki and mgiza.

Installing mgiza produces a file called "mgiza".
However, the Moses instructions on the wiki here
http://www.statmt.org/moses/?n=Moses.ExternalTools#mgiza
insist that the "mgiza" binary be renamed "mgizapp", but then
train-experiment.perl only accepts the binary called "mgiza".