Metacat

More changes to build process. No longer need the instdtd target
because it is handled by the install target. Updated installation
instructions accordingly.

Improvements to the build process that make it easier to install the DTDs
form EML. There are now three new targets in the build.xml file:

getdtd: uses cvs to get a working copy of a tagged release of eml
  instdtd: copies the DTDs from the build directory to the install directory...

README and build changes in preparation for the 1.0.0 release of Metacat.
The files contributing to this release are being tagged in CVS as
"METACAT_1_0_0".

Updated build.xml and README for a Beta 3 release. This is a temporary
release until the full Release 1.0 is produced next week.

Updated README file for the beta2 release. Added list of known issues,
which will need to be edited for the final release.

Added contact mailing address for bug reports and feedback.

Modified the license and copyright terms for many of the files. Added
a LICENSE file and a README file in preparation of a distribution.