Update $scanf, $printtimescale and the general is_numeric check for 2-state

This patch updates the $scanf and $printtimescale routines to work with
two-state variables. It also updates the general is_numeric check to
recognize two-state variables as numeric.

vpi/sys_display.c

@@ -1808,6 +1808,11 @@ static PLI_INT32 sys_printtimescale_compiletf(ICARUS_VPI_CONST PLI_BYTE8*name)
 	    switch (vpi_get(vpiType, arg)) {
 		case vpiFunction:
 		case vpiIntegerVar:
+		case vpiBitVar:
+		case vpiByteVar:
+		case vpiShortIntVar:
+		case vpiIntVar:
+		case vpiLongIntVar:
 		case vpiMemory:
 		case vpiMemoryWord:
 		case vpiModule:

vpi/sys_priv.c

@@ -169,6 +169,11 @@ unsigned is_numeric_obj(vpiHandle obj)
 
 	/* These can have a valid numeric value. */
       case vpiIntegerVar:
+      case vpiBitVar:
+      case vpiByteVar:
+      case vpiShortIntVar:
+      case vpiIntVar:
+      case vpiLongIntVar:
       case vpiMemoryWord:
       case vpiNet:
       case vpiPartSelect:
@@ -204,6 +209,11 @@ unsigned is_string_obj(vpiHandle obj)
 
 	/* These can have a valid string value. */
       case vpiIntegerVar:
+      case vpiBitVar:
+      case vpiByteVar:
+      case vpiShortIntVar:
+      case vpiIntVar:
+      case vpiLongIntVar:
       case vpiMemoryWord:
       case vpiNet:
       case vpiPartSelect:

vpi/sys_scanf.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2010 Stephen Williams (steve@icarus.com)
+ * Copyright (c) 2006-2011 Stephen Williams (steve@icarus.com)
  *
  *    This source code is free software; you can redistribute it
  *    and/or modify it in source code form under the terms of the GNU
@@ -552,6 +552,11 @@ static int is_assignable_obj(vpiHandle obj)
 	case vpiPartSelect:
 	    if (! is_assignable_obj(vpi_handle(vpiParent, obj))) break;
 	case vpiIntegerVar:
+	case vpiBitVar:
+	case vpiByteVar:
+	case vpiShortIntVar:
+	case vpiIntVar:
+	case vpiLongIntVar:
 	case vpiRealVar:
 	case vpiReg:
 	case vpiTimeVar: