New: Upgrade jquery flot library to 0.8.1

ChangeLog

htdocs/includes/jquery/plugins/flot/API.md

htdocs/includes/jquery/plugins/flot/CONTRIBUTING.md

htdocs/includes/jquery/plugins/flot/FAQ.md

htdocs/includes/jquery/plugins/flot/LICENSE.txt

htdocs/includes/jquery/plugins/flot/Makefile

htdocs/includes/jquery/plugins/flot/NEWS.md

htdocs/includes/jquery/plugins/flot/NEWS.txt

htdocs/includes/jquery/plugins/flot/PLUGINS.md

htdocs/includes/jquery/plugins/flot/README.md

htdocs/includes/jquery/plugins/flot/excanvas.js

htdocs/includes/jquery/plugins/flot/excanvas.min.js

htdocs/includes/jquery/plugins/flot/jquery.colorhelpers.js

...s/includes/jquery/plugins/flot/jquery.colorhelpers.min.js

htdocs/includes/jquery/plugins/flot/jquery.flot.canvas.js

...cs/includes/jquery/plugins/flot/jquery.flot.canvas.min.js

...cs/includes/jquery/plugins/flot/jquery.flot.categories.js

...ncludes/jquery/plugins/flot/jquery.flot.categories.min.js

htdocs/includes/jquery/plugins/flot/jquery.flot.crosshair.js

...includes/jquery/plugins/flot/jquery.flot.crosshair.min.js