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Fixed broken links to php.net and redirecting pages to php.net

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take care of file size change of zero

fix an unfortunate line break in one of the tabs of the mediamanager when using Arabic

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overrule left offset of jQueryUI Resizable added in rtl

If using a west handle, jQuery UI Resizable uses left offset to
position, assuming relative:absolute like setup.

- http://stackoverflow.com/q

overrule left offset of jQueryUI Resizable added in rtl

If using a west handle, jQuery UI Resizable uses left offset to
position, assuming relative:absolute like setup.

- http://stackoverflow.com/questions/28512111/resizable-div-that-
doesnt-change-left-property
- https://bugs.jqueryui.com/ticket/4985#comment:1

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changed footnote content to div

removed unused CSS (since 30fd72fb)

removed CSS support for IE8

removed obsolete vendor prefixes (and fixed broken gradients)

removed very old left overs from IE7 (and even IE6) support

less prominent styling of size changes

reusing the diff colors as suggested by @selfthinker

another tiny tab CSS addition

missed a line in my last commit

minor change to make tabs more flexible

This makes it easier to create tabs with an active tab (no need for
additional markup)

styled size changes

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