Allow postfix operator called as method after unary postfix hyper operator

currently something like '(my @a = 1)>>.++' fails, since METAOP_HYPER_CALL is called
instead of METAOP_HYPER_POSTFIX. Fixes RT #122342.
Allow dotted form of postfix operator after unary postfix hyper operator, but only for non-wordy operators

The previous version which special cased postfix:<i> only seemed too fragile.
Now the dotted form is allowed only for non-wordy operators.
Merge pull request #339 from usev6/nom

Allow postfix operator called as method after unary postfix hyper operator