[PATCH] eclipse plugins and guidelines

[Alex Dupre]

In there aren't strong objections in the next days I'm going to commit
the following patchset:

http://www.alexdupre.com/eclipse.diff

What it does:

- add a common makefile (eclipse/Makefile.plugins) to simplify
installing eclipse plugins

- use the correct/recommended equinox dropins directory
(share/eclipse/dropins) to install plugins, each in its own separate
directory

- simplify dependency tracking

- update (sync with eclipse 3.5) emf/xsd/gef/datatools/webtools eclipse
plugins

- adjust dependencies (last time) on all ports depending on the ones above

- switch eclipse-jad and subversive to use the new layout

-- 
Alex Dupre