Update JSqlParserCC.jj

Add support for DB2 Updates with Select clause
Update Update.java

Add support for DB2 Updates with Select clause
Update JSqlParserCC.jj

For DB2 "$" is also a standard letter, so handle "$" as #LETTER.
Update UpdateDeParser.java

Extend the deparser to support DB2 Updates with Select clause
Update Update.java

Add necessary Select import for Update with Select
Update UpdateDeParser.java
Update UpdateDeParser.java
Update UpdateTest.java

Add an SQL test for Update with Select
Merge pull request #78 from CeeKayGit/master

Add support for DB2 specials: Updates with Select clause & "$" as standard #LETTER.
Merge pull request #79 from CeeKayGit/patch-1

Update with Select - add test SQL and extend deparser
compile error corrected
little housekeeping
Merge remote-tracking branch 'upstream/master'