StringType and unicode

[wilsonr]

Using the 'json' module in run_tsudat.py allows the injection of unicode strings into ANUGA. This highlights a shortcoming in type testing.

The code fragment:

if type(my_string) == type(types.StringType):

will not do what is required if my_string is a unicode string. What should be done is the more future-proof:

if isinstance(my_string, basestring):

which handles normal strings as well as unicode strings correctly.

[wilsonr]

See ​http://docs.python.org/library/functions.html#basestring for the gospel.

[wilsonr]

Made changes suggested above.

Also changed uses of types.ListType to list, etc.

Removed import of types module where possible.