0.113

I tried to upload 0.113 last night, but the tarball got corrupted somehow, so I'll try again tonight... but this time with 0.114. Briefly, the changes are:
+ minor bug fixes in JarFileSystem (canRead()/canWrite() should check existance of file)
+ add charToString() function, to convert an int key code (such as returned from Reader#read) to a string
+ little bug fix in compiler, seen when an Expression follows an ImportBlock
+ bug fix for determining which java method to call, when there is a choice between multiple methods that take different args... prefer the method that doesn't convert a InexactNumber to an byte/short/int/long or an ExactNumber to a float/double
+ bug fix: java.lang.Character should be converted to script type String
+ add getJavaException method to JavaException exception type
+ use UMLDoclet to generate UML diagrams along with javadoc API docs