[Po4a-devel] allow TransTractor to pass PO options

[poy]

attached patch allows TransTractor to pass "package-name" and similar 
PO-related options (parsed by the Po module) when calling po4a-gettextize. 
otherwise, it's impossible to define these options because the first module 
loaded by TransTractor (eg, Xml) will deem these options as invalid.

i simply duplicated what was already being done for the "porefs" option.

poy 
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