Make acprep use "str.split" not "string.split"
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.
duncanmortimer/ledger,jwakely/ledger,afh/ledger,afh/ledger,duncanmortimer/ledger,ledger/ledger,duncanmortimer/ledger,ledger/ledger,paulbdavis/ledger,paulbdavis/ledger,duncanmortimer/ledger,jwakely/ledger,ledger/ledger,jwakely/ledger,ledger/ledger,paulbdavis/ledger,duncanmortimer/ledger,afh/ledger,jwakely/ledger,paulbdavis/ledger,jwakely/ledger,ledger/ledger,paulbdavis/ledger,afh/ledger,paulbdavis/ledger,afh/ledger,jwakely/ledger,duncanmortimer/ledger,jwakely/ledger,paulbdavis/ledger,duncanmortimer/ledger