Downgrade imglib2-io to use Bio-Formats 4.4 API

The 4.4.x stable releases are what OME is officially supporting, and are
less volatile than the 4.5.x development code (which has still not seen
a release).

This essentially reverts the following two commits:
  * 86fbb6706408e8788f1e08c43ea9c16dc50b99d3
  * 6b9c07e80585b293084c70330fef17fc458c300d

Note that this change is rather temporary, and mainly for the impending
2.0.0-beta-7 release. After that, we will switch to using the new SCIFIO
API (see https://github.com/scifio/scifio for details). The only reason
we don't switch right at this moment is that the new SCIFIO is still
missing one key feature: it cannot lean on Bio-Formats 4.4.x to read
proprietary file formats which have not yet converted to the new API.

Once SCIFIO supports such a fusion, the imglib2-io project will go away
in favor of ImgOpener and ImgOpener support directly in scifio.
Add some convenience methods to Histogram1d
Add resetCounters() to histogram implementations
Bump to next development cycle

Signed-off-by: Curtis Rueden <ctrueden@wisc.edu>
removed invalid operation
Merge branch 'master' into knip

Conflicts:
	io/src/main/java/net/imglib2/io/ImgOpener.java
	ops/src/main/java/net/imglib2/ops/operation/labeling/unary/ExcludeOnEdges.java