added BUG-120, somehow losing pref info. No prints are working in PROD, so changed a lot of printf( in the F/E to SetFELog with error and persistent/cant_close set across many files. Also used opportunity to remove a few unnecessary debugs

files.py

@@ -588,7 +588,7 @@ def view_list():
     # this occurs when we went from the last image on a page (with how_many on
     # it) and it just happened to also be the last in the DB...
     if not entries:
-        print("DDP: DONT think this can happen anymore")
+        SetFELog( message="DDP: DONT think this can happen anymore", log_level="error", job=None, persistent=True, cant_close=True )
 
         # undo the skip by how_many and getentries again
         OPT.offset -= int(OPT.how_many)
@@ -676,7 +676,7 @@ def view(id):
     eids=eids.rstrip(",")
     # jic, sometimes we trip this, and rather than show broken pages / destroy
     if id not in eids:
-        print( f"ERROR: viewing an id, but its not in eids OPT={OPT}, id={id}, eids={eids}")
+        SetFELog( message=f"ERROR: viewing an id, but its not in eids OPT={OPT}, id={id}, eids={eids}", log_level="error", persistent=True, cant_close=True)
         msg="Sorry, viewing data is confused, cannot view this image now"
         if os.environ['ENV'] == "production":
             msg += "Clearing out all states.  This means browser back buttons will not work, please start a new tab and try again"