fix maximized panel sliders not restored #402

This also makes only the right/lower panel(s) auto-resize on window size
change.
README, man: update kernel polling instructions #403
look in applications subdirs for .desktop file; debug info #405
clear g_ascii_strcasecmp warning on owner sort
case insensitive app sort, tooltips, uniq in app chooser dialog #405
app chooser dlg tooltip show Name, Exec, Terminal #405
Merge branch 'next' of https://github.com/IgnorantGuru/spacefm into next