papistui: Add page scroll and info window

Added info window displaying abstracts or citation information.
Added quick page scrolling with <c-f> <c-u> mimicking vim.

writing/.config/papis/papistui.yaml

@@ -25,18 +25,37 @@ documentlist:
     rowstyle: white_bg
     separator: " \u2502 "
 keymappings:
-  ' ': mark_selected
+  ' ': mark_down
   /: search_mode
   <key_down>: scroll_down
   <key_up>: scroll_up
+  <ctrl-f>: page_down
+  <ctrl-b>: page_up
   '?': help
   G: jump_to_bottom
-  e: edit
   gg: jump_to_top
   j: scroll_down
   k: scroll_up
   o: open
+  e: edit
+  n: papis edit -n papis_id:{doc['papis_id']}
   q: quit
+  t: tag
+  ii: 
+    - info_toggle
+    - "Toggle info window"
+  ij: 
+    - info_cycle
+    - "Cycle info windows"
+infowindow:
+  default_on: False
+  views:
+    apa:
+      content: "{format_reference(doc)}"
+    abstract:
+      content: "{doc['abstract']}"
+      linewrap: True
+      height: 8
 statusbar:
   left:
     default: <black_white> {info["mode_upper"]} <black_white>