MCOL-669 TEXT cpimport fixes

* 64KB TEXT column had off-by-one length pointer counting
* TEXT I_S/LDI was looping where it shouldn't causing pointer issues
* TEXT data type wasn't fully understood by cpimport

writeengine/shared/we_type.h

@@ -152,7 +152,8 @@ namespace WriteEngine
                 "unsigned-int",
                 "unsigned-float",
                 "unsigned-bigint",
-                "unsigned-double"
+                "unsigned-double",
+                "text"
          };
 
     enum FuncType { FUNC_WRITE_ENGINE, FUNC_INDEX, FUNC_DICTIONARY };