Correction in readme.md reg. the SDBG license and a few small fixes in Eclipse .project & .settings/ files

Most important is the clarification reg. the SDBG license.
As discussed a few weeks ago, the DART *editor* is NOT having the BSD license, but EPL (the Eclipse Public License). IANAL, but switching from EPL to BSD would be very difficult, given that the copyright is held by the Dart team (copyright of an open source code matters only when switching from one license to another, as otherwise the code is open :) ) and *there is no real need to do it*, given that EPL is pretty open either, and kind of a standard for Eclipse plugins.