Implemented the "insert()" method and wrote a test to test it. The new test
depends on the property "newdocid" be set to something unique in the build.xml
file so that the insert will work properly. Probably need to fix this to be
some kind of autoincrement counter or random number so that it can be run
several times in succession. Right now, if you run the test without resetting
the newdocid property (and touch the test file), it will fail on the second
and subsequent passes.