moved compiler to its own directory

compiler/ArrayTypeRewrite.jrag

compiler/CS_CodeGen.jrag

compiler/C_CodeGen.jrag

compiler/ErrorCheck.jrag

compiler/Java_CodeGen.jrag

compiler/LabComm.ast

compiler/LabComm.java

compiler/LabCommParser.parser

compiler/LabCommScanner.flex

compiler/LabCommmTokens.jrag

compiler/NameAnalysis.jrag

compiler/PrettyPrint.jrag

compiler/Python_CodeGen.jrag

compiler/Signature.jrag

compiler/build.xml

compiler/tools/JFlex.jar

compiler/tools/beaver-rt.jar

compiler/tools/beaver.jar

compiler/tools/jastadd2.jar

compiler/tools/proj.jar