DOC remplace iff by if and only if
Merge pull request #1315 from sciunto/ffi

DOC remplace iff by if and only if
Clip to min and max range of input image, add missing clip parameter to other functions
Introduce parameter to keep range of values
Fix keep_range and add test cases
Create helper function for image conversion
Make sure 1x1 images are 2-D
Remove test for invalid shape
Rename keep_range to preserve_range, fix test cases
Remove __init__.py from tests folder, remove unnecessary load of test image
Fix matching test cases
Fix novice module with new dtype behavior
Use in-place operation for clipping
Add more description to doc string of helper function
Add missing return value description
Merge pull request #1302 from ahojnnes/warp

Clip to min and max range of input image, add missing clip parameter to ...
# This is a combination of 7 commits.
# The first commit's message is:
Add a known_warning decorator and suppress warnings in color pkg

# This is the 2nd commit message:

Use the existing all_warnings context manager

# This is the 3rd commit message:

Raise warnings in data

# This is the 4th commit message:

Raise warnings in draw

# This is the 5th commit message:

Raise warnings in exposure

# This is the 6th commit message:

Suppress warnings in exposure tests

# This is the 7th commit message:

Add comments about warning suppressions
Handle warnings in several packages

Start handling warnings in data, exposure, and draw

Add a known_warning decorator and suppress warnings in color pkg

Use the existing all_warnings context manager

Raise warnings in data

Raise warnings in draw

Raise warnings in exposure

Suppress warnings in exposure tests

Add comments about warning suppressions

Raise warnings in feature

Fix warnings in filter package

Add warning handling to graph

Handle warnings in io package
Handle more warnings and reset io plugins as needed

Reset plugins prior to running collections test

Handle warnings in morphology pkg

Add __init__ for morpohology tests

Handle warnings for novice pkg

Handle warnings for restoration pkg

Handle warnings for segmentation pkg

Handle warnings for _shared pkg

Handle warnings for transform pkg

Handle warnings for util pkg

Handle warnings in viewer module
Accommodate upcoming changes to RectangleSelector API