Make "bookmarks" array static
Add simple bookmarks querying unit-test
Separate special bookmarks from other ones
Separate visual selection marks ('<' and '>')

It allows to restore it via "gv" in both panes.

Thanks to filterfalse.
Fix restoring visual selection by gv in both panes

Used view instead of curr_view, view wasn't even initialized at
that point for the first time, but it worked as marks didn't exist
as then as well.
Merge branch 'make-sel-bmarks-local'

Separate visual selection marks ('<' and '>'), which allows to restore it
via "gv" in both panes.

Thanks to filterfalse.