OMEROFormat: strip prefix, not suffix

Now that we use omero:, we need to strip that, rather than the old
".omero" suffix.
OMEROFormat: handle dims of length 1
OMEROFormat: readd support for .omero suffixes

The writers are currently limited to suffix matching only, so we need
this for the time being.
OMEROFormat: fix width & height determination bug
OMEROFormat: fix ZCT logic

There is now a shared zct conversion method that does the work, and uses
the SCIFIO API to derive the axis indices as it should.

This change also adds a check for position indices greater than
Integer.MAX_VALUE, on the off-chance that that ever happens.
Bump to pom-scijava 1.149