Fix and re-enable DocTests
Cleaned up commodities and completion code.
Merge pull request #333 from afh/pull/DocTests

Fix and re-enable DocTests
support date as well as datetime in Balance.value()

cargo-cut'n'paste from py_amount.cc
Merge pull request #336 from csrhodes/master

support date as well as datetime in Balance.value()
Simplifies parsing of the beginning of an act.  This allows fontifying effective dates.
Merge branch 'master' into ledger-mode-code-cleanup
Fix effective date command.
Doc string cleanup.
Doc string cleanup.