Line-wrap long module names

[pkgw]

The code in tt-weave that renders module references doesn't perform any linewrapping, because I thought/hoped that all module names would be short enough to make wrapping unnecessary. As demonstrated in XAP:47 and other places, some module names are sufficiently long that we really should wrap.

This logic should also do the right thing in the part of the code that emits the beginning of a named module code chunk, as in XAP:51.