Added more Tests for Moving Histogram Algorithm

[spran180]

Fixes #752

• Added unit test for T = float.
• Added unit test for cases when range min and max are negative.
• Added unit test for case when window length is equal to one.
• Added unit test for case when there are multiple values in every bin.
• Added unit test to see bins change when window is moved.
• Added unit test for out of bounds values.

[gavv]

Thank you!

A few cosmetic fixes: 2314fa4498b1cec19014cddc80ead534ceaf20a6