Make acprep use "str.split" not "string.split"

Python is displeased with acprep if a *FLAGS environment variable is
set. This patch converts the problematic "string.split" statement to
instead be "str.split", which appears to fix the problem.
Merge pull request #189 from Travis-Snoozy/master

Make acprep use "str.split" not "string.split"
Resolve bug 957 update reconcile buffer when saving ledger buffer
Merge commit '900af573319c3787854abc5653c8133d37eb013f'
Bump version number, fix README files
Fix bug #855
Merge pull request #190 from thdox/bug_855

Fix bug #855
Improve documentation about differences between ledger 2.6 and ledger 3.0.
GnuCash support removed, environment variables deprecated.
Change format to "%Y-%m-%d", as described in documentation, and as coded
in report.h
Merge pull request #192 from thdox/report

Change format to "%Y-%m-%d"
Merge pull request #191 from thdox/doc_diff_from_previous

Improve documentation about differences between ledger 2.6 and ledger 3.0
Fix bug 969, payee completing only works with plain alpha chars
Completion improvements