Applied patch attached to issue2550723. Problem in index page @pagesize=0 not properly propigated to previous batch link (is set to actual number of entries displayed). Using demo.py verified original issue with 0 page size. Also verified that a non-zero page size was properly propigated (values 5 and 20). Applied patch attached to issue. Verified issue with size 0 fixed. Verified that values 5 and 20 worked correctly. Updated CHANGES.txt.

//
// Utility classes
// --------------------------------------------------


// Quick floats
.pull-right {
  float: right;
}
.pull-left {
  float: left;
}

// Toggling content
.hide {
  display: none;
}
.show {
  display: block;
}

// Visibility
.invisible {
  visibility: hidden;
}

// For Affix plugin
.affix {
  position: fixed;
}