mt940: Parse only supported tags in _find_swit_tags

[ced, 2016-10-15 19:35:52]

Could you put a description of what was the problem.
Also there is a typo in title.

[ced, 2016-10-24 13:50:34]

The problem must be reported on https://mt940.b2ck.com/

https://codereview.appspot.com/313860043/diff/1/mt940/test.py
File mt940/test.py (right):

https://codereview.appspot.com/313860043/diff/1/mt940/test.py#newcode131
mt940/test.py:131: self.assertEqual(rabo_description(
start rabo_description on a new line.

https://codereview.appspot.com/313860043/diff/1/mt940/test.py#newcode137
mt940/test.py:137: 'remi': '/INV/16000291 29.7.2016'})
I think this is wrong. /REMI// means empty remi.

[nicoe, 2016-10-25 14:03:19]

https://codereview.appspot.com/313860043/diff/1/mt940/test.py
File mt940/test.py (right):

https://codereview.appspot.com/313860043/diff/1/mt940/test.py#newcode131
mt940/test.py:131: self.assertEqual(rabo_description(
On 2016/10/24 13:50:34, ced wrote:
> start rabo_description on a new line.

Done.

https://codereview.appspot.com/313860043/diff/1/mt940/test.py#newcode137
mt940/test.py:137: 'remi': '/INV/16000291 29.7.2016'})
On 2016/10/24 13:50:34, ced wrote:
> I think this is wrong. /REMI// means empty remi.

The fact is there is no norm about that, using :86: to transmit additional
information is just a hack.

The best I could find was
https://www.rabobank.com/nl/images/Format_Description_MT940%20_2.4_EN.pdf

[nicoe, 2016-10-25 14:03:41]

fix remark

[ced, 2016-10-25 14:29:47]

https://codereview.appspot.com/313860043/diff/1/mt940/__init__.py
File mt940/__init__.py (right):

https://codereview.appspot.com/313860043/diff/1/mt940/__init__.py#newcode176
mt940/__init__.py:176: next_tag_index = len(description)
I find the name should be something like a cursor until it is actually the real
next_tag_index.

[nicoe, 2017-02-21 15:19:11]

fix remarks

[ced, 2017-02-21 16:51:52]

LGTM