Add support for multiple identifier lookup to the magic wand tool. Enable shift+enter for submitting input in multiline mode. Use shift+enter in single line mode to convert to multiline
Restructure multiline toggling. Move multiline progress bar next to the search button.
Some tweaks to ISBN discovery
Don't import duplicate identifiers
Merge remote-tracking branch 'aurimasv/multipleLookup'

Conflicts:
	chrome/locale/en-US/zotero/zotero.dtd