cherry-pick 9a89be5a: renamed Type to DataType in grammar

compiler/2014/ArrayTypeRewrite.jrag

compiler/2014/CS_CodeGen.jrag

compiler/2014/C_CodeGen.jrag

compiler/2014/DeclNames.jrag

compiler/2014/FlatSignature.jrag

compiler/2014/Java_CodeGen.jrag

compiler/2014/LabComm.ast

compiler/2014/LabCommParser.parser

compiler/2014/NameAnalysis.jrag

compiler/2014/PrettyPrint.jrag

compiler/2014/Python_CodeGen.jrag

compiler/2014/RAPID_CodeGen.jrag

compiler/2014/Signature.jrag

compiler/2014/TypeCheck.jrag

compiler/2014/TypeReferences.jrag

doc/tech_report.tex

lib/java/se/lth/control/labcomm2014/ASTbuilder.java