Widgets use the same evolution graph having the same id, causing widgets to not display #3388

It was reported in the forums that widgets might not all work with IE9. Let's try and reproduce and fix this error as suggested in the forum: http://forum.piwik.org/read.php?2,81831,page=1#msg-93868

If 'Visits over time' and 'Visits overview (with graph)' widgets are on the same dashboard there occurs an js-error in ie 9 and the widgets aren't displayed correct

the problem seems to be that both widgets uses the same evolution graph having the same id. that results in an js error in jqplot. the error is reproducable in all browsers.

What do you think about adding the name of the controller action in the unique ID string to prevent having same IDs for different widgets?

In 56ff24c7a0cb71f7886821a4d369c3d3cb1ab353: Fixes #3388, added DataTableManager JS class used to initialize and set element ID for all DataTable in browser, instead of using report as element ID.

In 2bb94cebd49657961cdf8f697782e929bc6f15d1: Refs #3388, fix regression in visitor log and remove use of window.dataTables in favor of jQuery.data.

In 492c651fc031c6f2b417fb986540e127e31d29bc: Refs #3388, fix regression in initial load of evolution graphs.

In 9e112cd884795453057da5fbf1ad5efbd0f3445c: Refs #3388, fix another regression that affects row evolution popups w/ external series toggle.

In 1149f26a1f134c824f33502b9e02148eabd49704: Refs #3388, fix subtable loading regression and add docs explaining how id is set to datatable.js.