Parser: simplify dump of itemset
Raw_parser: add EXITPOINT and `Shift_token annotation
Raw_parser: generate larger location in match_case
Recovery/Raw_typer: update to latest Raw_parser
BrowseT: introduce Dummy node for default case
Parsing_aux: simplify compare_pos
Browse: fix environment generation

This should fix regression in environment selection.
When environment is not known at current point, BrowseT use default_env
as a fallback.

Browse.fix_loc or BrowseT.annot were then expected to fill this hole.
… Now this is done :)