Fix string/bytes issues under python 3. 1) cgi/client.py: override cgi.FieldStorage's make_file so that file is always created in binary/byte mode. This means that json (and xml) are bytes not strings. 2) rest.py: try harder to find dicttoxml in roundup directory or on sys.path. This just worked under python 2 but python 3 only searches sys.path by default and does not search relative like python 2. 3) rest.py: replace headers.getheader call removed from python 3 with equivalent code. 4) rest.py: make value returned from dispatch into bytes not string. 5) test/caseinsensitivedict.py, test/test_CaseInsensitiveDict.py: get code from stackoverflow that implements a case insensitive key dict. So dict['foo'], dict['Foo'] are the same entry. Used for looking up headers in mocked http rewuset header array. 6) test/rest_common.py: rework tests for etags and rest to properly supply bytes to the called routines. Calls to s2b and b2s and use of BytesIO and overriding make_file in cgi.FieldStorage to try to make sure it works under python 3.

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Roundup Glossary
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class
   a definition of the properties and behaviour of a set of items
db (or hyperdb)
   a collection of items
designator
   a combined class + itemid reference to any item in the hyperdb
itemid
   a numeric reference to a particular item of one class
item
   a collection of data that forms one entry in the hyperdb.
property
   one element of data that makes up an item. In Roundup, the set 
   of item properties may be changed as needed - even after the 
   tracker has been initialised and used in production.
schema
   the definition of all the classes that make up an tracker
tracker
   the schema and hyperdb that forms one issue tracker
tracker home
   the physical location on disk of a tracker


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