BUGFIX: composing output in Transfer tools

Use sprintf(), not printf() in appending to output buffer in mem/correction_pages/*TransferTool.php
BUGFIX: composing output in Transfer tools (2)
CustdataModel.php changed default of ChargeOk to 0
Changed ChargeOk default to 0

In install/sql/op/custdata.php
And updated comments re ChargeOk, Balance, MemDiscountLimit, ChargeLimit
Update HELP of arbalance.sanitycheck
Update HELP in nightly.ar
Merge remote-tracking branch 'origin/master'