* net/loveruby/cflat/compiler/TypeChecker.java: check type (incomplete).
* net/loveruby/cflat/type/Type.java: new method #isCompatible, #isCastableTo.
* net/loveruby/cflat/type/IntegerType.java: override them.
* net/loveruby/cflat/type/UnsignedCharType.java: change textize result.
* net/loveruby/cflat/type/UnsignedLongType.java: ditto.
* net/loveruby/cflat/type/UnsignedIntType.java: ditto.
* net/loveruby/cflat/type/UnsignedShortType.java: ditto.
* net/loveruby/cflat/ast/AbstractAssignNode.java: new method #setRHS.
* net/loveruby/cflat/ast/AssignNode.java: is now an AbstractAssignNode.
* net/loveruby/cflat/ast/BinaryOpNode.java: new methods #setLeft, #setRight.
* net/loveruby/cflat/ast/FuncallNode.java (type): does not rely on #function (can get type of non-static function).
* net/loveruby/cflat/ast/CondExprNode.java: new methods #setThenBody, #setElseBody.
* net/loveruby/cflat/ast/TypeNode.java: new constructor by Type.
git-svn-id: file:///Users/aamine/c/gitwork/public/cbc/trunk@3762 1b9489fe-b721-0410-924e-b54b9192deb8