bnc#892610: OOXML import: Improve chart number formats.

If sourceLinked is used, do not set "PercentageNumberFormat" even if
showPercent is true. The format string should be used for "NumberFormat".

c8cc89ff802d86b1f3a69afe1b4835b7df7f70c7 unnecessarily disabled
"LinkNumberFormatToSource". Use that for data labels but not for axis.

Also, actually make attaching number format supplier work for Calc.
Previously, non standard formats were added into wrong supplier,
and they were thrown away later because it was attached too late.
(See also ChartModel::attachNumberFormatsSupplier)

Change-Id: Iaf9945abc3d82d0ac63d9f36b8888eb49f39ab57