Round up the inputunit length and do not add one.

For cases where the input length is exactly divisible by the
inputunit size, the +1 is incorrect.
Use float, else ceil() is meaningless
Update docs to reflect changes in report filename format
Update archive reports script to reflect report format changes
Update version in __init__.py to match tag
Merge branch 'input_unit_length'

* input_unit_length:
  Use float, else ceil() is meaningless
  Round up the inputunit length and do not add one.