Region level summary keywords may have suffixes which refer to user
defined region sets ('FIP*' keyword). This commit prunes those
suffixes when performing function lookup, so that we do not get
false negatives.
To this end, introduce a new helper function
EclIO::SummaryNode::normalise_region_keyword()
and use this both when determining the summary keyword type (rate,
cumulative, pressure &c) and when looking up evaluation functions
for region level summary vectors. The new helper could arguably
have been integrated into the existing 'normalise_keyword()' helper
function, but that would have necessitated a different change
elsewhere in the code base. For now, we keep this helper as a
separate function.
9a3e8dba23