Source clean-up, portability and debugger fixes. (PR #842)

And fix two general issues:
- confusing behavior when entering the builtin (mini) assembler mode,
- and also fixes the "cl" (clear flag) command - which was documented, but did not work at all (due to an "interesting" command/syntax conflict...).

source/Debugger/Debugger_DisassemblerData.cpp

@@ -116,7 +116,7 @@ WORD _CmdDefineByteRange(int nArgs,int iArg,DisasmData_t & tData_)
 		else
 			sprintf( aSymbolName, "B_%04X", tData_.nStartAddress ); // DB range
 
-			pSymbolName = aSymbolName;
+		pSymbolName = aSymbolName;
 	}
 
 	// bRemoveSymbol = false // use arg[2]