Added a script that parses a SPICE file and prints the parameters that
are on the .subckt line, and the parameters that are internal to the
subcircuit in a .param statement.  Also, corrected spectre_to_spice.py
to not add braces around an expression that is already encapsulated by
single quotes, as that causes grief to ngspice.
diff --git a/common/spectre_to_spice.py b/common/spectre_to_spice.py
index 824b306..0bba1c6 100755
--- a/common/spectre_to_spice.py
+++ b/common/spectre_to_spice.py
@@ -103,6 +103,8 @@
 
             if is_number(value):
                 fmtline.append(value)
+            elif value.strip().startswith("'"):
+                fmtline.append(value)
             else:
                 fmtline.append('{' + value + '}')
 
@@ -533,13 +535,6 @@
         # Copy line as-is
         spicelines.append(line)
 
-    # Make sure any pending model lines are taken care of
-    if modellines != []:
-        for line in modellines:
-            spicelines.append(line)
-        modellines = []
-        inmodel = False
-
     # Output the result to out_file.
     with open(out_file, 'w') as ofile:
         for line in spicelines: