Added assert: MetaDict.assignFrom() param must be another MetaDict
Added OpReorderAxes and test.
This will eventually replace Op5ifyer because it is:
- more flexible (output axes can be fewer than 5)
- shorter and simpler
- cleaner (follows modern lazyflow syntax and naming conventions)
- more efficient (avoids unecessary copies)
- has a clearer name
Merge branch 'axis-reorder'