Improvement to symbol library user field parsing, when user field tex…

…t contains double-quotes (ex: in reference to 'inch' imperial unit)

schlib/schlib.py

@@ -153,11 +153,15 @@ def __init__(self, data, comments, filename, documentation):
         for line in data:
             checksum_data += line.strip()
             line = line.replace('\n', '')
-            s = shlex.shlex(line)
-            s.whitespace_split = True
-            s.commenters = ''
-            s.quotes = '"'
-            line = list(s)
+            if '\\"' in line:
+                import re
+                line = re.findall(r'(?:[^\s,"]|"(?:\\.|[^"])*")+', line)
+            else:
+                s = shlex.shlex(line)
+                s.whitespace_split = True
+                s.commenters = ''
+                s.quotes = '"'
+                line = list(s)
 
             if len(line) == 0:
                 continue