removed use of last_entry_in_db (boolean) and replaced with use of current/first_eid/last_eid in PA_USER_STATE so it persists across reloads/back buttons, and allows full use of ajax data retrieval in the background for the viewer (so fullscreen stays across page loads), and the next/prev buttons are set on the image load, not after they have been pressed "one too many times"

TODO

@@ -18,7 +18,8 @@
         * viewlist 
             - [DONE] can work out new view_eids server side, and pass them back as json data (fixes loss of fullscreen & back/fwd issues)
             - [DONE] should really define the first/last of a GetEntries search and use definitive logic to show at start or end of entries (for next/prev buttons in viewer.html)
-            - need to keep "current", "first_eid", "last_eid" in pa_user_state to support back button / reloading view/<current> and better handling of next/prev
+            - [DONE] store "current", "first_eid", "last_eid" in pa_user_state 
+                - use them on reload, e.g. if current set use it not view eid (should be okay with client-side skipping, and just make sure if it is viewlist we use next/prev logic not current
             - can consider an optim-- new_view page makes calls to viewlist to ADD json data only, so only trigger a new "viewlist" if we dont have data for that part of the eids
         job.py:@app.route("/jobs", methods=["GET", "POST"])
         job.py:@app.route("/job/<id>", methods=["GET","POST"])
@@ -37,7 +38,7 @@
 
     * refimg locns can lose an array idx of 0 always.
 
-    * search allow noo?
+    * search allow noo
 
     * delete folder