Removed unused function LineParser::readLineOf.
Renamed LineParser to line_parser_t, removed unused type ParseError.
Removed an "equality" operator that was only applicable to unit test code.
Removed a TODO that said another comment was wrong.  Also removed the wrong comment and added an assertion.
Fixed compilation of unit test, removed unused parameter in internal_node.
Renamed is_singleton to is_doubleton.
Made perfmons use cache_line_padded_t in a couple places that seem relevant.
Removed a TODO comment that was TODONE.
Fixed typo in comment.
Moved store_subview_t to its own header.
Merge branch 'sam_timestamps_with_a_vengeance' into sam_2134_base
Merge branch 'next' into sam_2000

Conflicts:
	src/store_view.hpp
Made pmap code use int64_t where it used int (semi-dangerously) before.
Redated a dated TODO.
Avoided redundant comparisons, using datum_t::cmp instead.
Redated some dated TODOs.
Merge branch 'next' into sam_todos
Merge branch 'sam_todos' into next
Merge branch 'next' into sam_2000
Merge branch 'sam_2000' into next