Eclipse classpaths for core (i.e. not extensions) changed using
http://sourceforge.net/projects/libcontainer/ to reference directories
rather than jars, which more closely matches how the Ant build works.
Amended extensions classpaths to use LibContainer
(http://sourceforge.net/projects/libcontainer/) as well
Revert "Fix jQuery UI links, fall back to jQuery 1.9.1 as bundled with UI"

This reverts commit 1fb25fcd7c2796ae92ad4e03c57b11a28266e353.
Revert "Fix some deprecated uses of attr().  Backward compatible to jQuery 1.6"

This reverts commit 0abe663ec0b47ff006e157f19a4edf22837a3cca.
Revert "Update to latest JQuery and JQuery UI - closes #817 - also remove our custom ESC key handler and its eventstack plugin dependency since this is handled by default by jQuery"

This reverts commit 094562e54b5c6a9af0df151f28996e860081bd47.
Text transform can set "" on null cells and vice versa.

Previously if a transformation expression resulted in "" or null and the
cell's previous value was "" or null then nothing would be changed.

Partial fix for #820 ( 1 on his list) that opens smallest possible can
of worms re blank/null handling. May break backwards compatibility on
projects that relied on old behaviour, though I think it unlikely anyone
has such a thing.