numbering system. In revision, 4179, it was inadvertantly
changed to be 0-based. This caused the breakpoints to be
off by one line.
M src/edu/rice/cs/drjava/model/debug/Debugger.java
M src/edu/rice/cs/drjava/model/debug/jpda/JPDADebugger.java
M src/edu/rice/cs/drjava/ui/DefinitionsPane.java