Jar Sources/Jar Classes options mutually exclusive,
but the Executable options available also if only Jar All
is selected. Allowing jar creation to proceed if duplicate
entry errors in a JAR file occur.
Disabled a log file that was left on.
M src/edu/rice/cs/drjava/ui/JarOptionsDialog.java
M src/edu/rice/cs/drjava/ui/MainFrameTest.java
