Editorially provided publication info

[seanredmond]

Anything in brackets we would usually mark up as a <note>, but what about when it's regular publication info?

In these entries, "1951", "London" etc. are presumably in brackets because they aren't printed on the title page or something like that. I think we should just encode them as what they are (<pubDate> etc) and not as notes, but preserving the brackets, e.g.:

<publisher><pubPlace>Boston</pubPlace>, <pubName>Houghton Mifflin</pubName>, <pubDate date="1951">[1951]</pubDate></publisher>
<publisher><pubPlace>[London]</pubPlace> <pubName>Faber &amp; Faber</pubName></publisher>
<publisher>[</pubPlace>Wilmington</pubPlace>, <pubName>Delaware State Society for Mental HygieneM/pubName>]</publisher>