Import from Toolbox format now accomodates items that begin with any field label and metadata

Before, import from Toolbox format assumed that items began with \ge,
but not all toolbox files do this, so now it searches for the first
instance of backslash+alphabetic characters+space and uses this label
to delimit items

Also, material from before this first toolbox label is ignored for the
purposes of the actual data array and instead it's treated as metadata
and added to the "goal" field on import

Fixes #1176