Add LEDGERBAL tag support, MS Money compatible output

[tstabrawa]

This PR adds the ability to generate OFX files that are supported by MS Money.

For convenience, I broke the changes down into the following logically-distinct commits:

• Ignore vim temp files
• Add option for MS Money compatible output
  • Deal with MS Money idiosyncrasies RE: OFX formatting
  • MS Money specific OFX header
  • Provide dummy value for TRNUID
  • Don't include blank CHECKNUM
  • Limit payee length to 32 chars
  • Use noon for dates lacking a time (Recommended by MS Money troubleshooting OFX guide)
• Include LEDGERBAL in non-split OFX output if possible
  • These are required fields per OFX spec & their absence breaks MS Money import.
• Update Schwab Bank tests for MS Money + LEDGEBAL features
• Add tests for ending balance analysis
• Update example --help output

Replaces PR #93.

Confirmed code changes are equivalent to PR #93 and tests are passing (by manually running ./tests/test.py -- for some reason, manage lint hangs for me and manage test throws a AttributeError: module 'collections' has no attribute 'Callable' error for me now).

Let me know if you have any questions or there's anything else you'd like split into multiple PRs.

Thanks!

[tstabrawa]

Some additional information that might help with understanding the changes made for MS Money:

• MS Money OFX analysis tool: http://moneymvps.org/faq/article/366.aspx
• MS Money OFX info: http://moneymvps.org/faq/article/8.aspx
  • MS Money troubleshooting OFX guide: http://moneymvps.org/downloads/ofx/TroubleshootingOFX.doc

MS Money itself is available here, if you'd like to verify compatibility for yourself: https://web.archive.org/web/20200415062254/http://www.microsoft.com/en-us/download/details.aspx?id=20738

[tstabrawa]

Thanks for merging. Have a good night!