Use local variable for meta.getTable() consistently

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Do not strip *all* 1-length axes

When we read a 1x1 image, we really want it to have X and Y axes of
length 1...!

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Read ImageJ 1.x slice labels

We now put the slice labels -- if any -- into the metadata table,
as String[], under the key "SliceLabels".

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Add HACK warning

The "SliceLabels" string is temporary, and should not be relied on.
Merge pull request #209 from scifio/slice-labels

Support reading slice labels written by ImageJ 1.x