Update the Java API to be consistent with recent changes to the Rhizome
REST API was that regularised the MIME types used in Content-Type
headers.
Add some missing CONTENT_TYPE_ constants to "httpd.h", and ensure they
are consistent with the Java getMimeType() methods in subclasses of
AbstractId.
Add the --stderr option to all executeJavaOk statements in the
'rhizomejava' test script, to reveal the exception message in the case
of failure.
Re-organised all Java source code under the java-api subdirectory, which
also contains a Makefile.in that performs the Java compilation. This
makefile is only invoked if ./configure finds a working Java compiler.
Use POST /restfule/rhizome/insert REST request to add bundles instead of
CLI 'rhizome file add', to avoid database locking storm and prepare for
replacing polling with trigger-based wakeup in newsince requests.
Add environment variable SERVALD_RHIZOME_DB_RETRY_LIMIT to extend the
Rhizome DB retry period, set it to 60 seconds in RESTful tests to
override the default 5 seconds
