Start of dmd 2.064 beta program

[Walter Bright]

http://ftp.digitalmars.com/dmd2beta.zip

Current list of regressions:

http://d.puremagic.com/issues/buglist.cgi?query_format=advanced&bug_severity=regression&bug_status=NEW&bug_status=ASSIGNED&bug_status=REOPENED

This isn't a release candidate, in particular the documentation needs work, but 
we need to shake the tree for any undetected regressions.

Further beta announcements go in the dmd-beta mailing list.

Note that this release contains:

29 enhancements
307 dmd bugs fixed
14 druntime bugs fixed
73 phobos bugs fixed