Develop fix acc doc

The documentation has been updated according to issue #16

Update pdf 2.2.0

Upgrade to 2.2.0

Increased the version number according to SEMVER.
Fixes issue 11.

Merge develop into master

This is an important merge.
After this we all will be able to follow the new developing strategy.
Please @nevensf could you confirm in the discussion below that the features 'Load ice', 'Load obsonly' and 'Plot stereo map' work properly?
Please @cprodhomme could you confirm in the discussion below that the feature 'Plot ACC' works properly?
To confirm that a feature works you can write in a comment 'Feature_name 👍'

Thanks a lot!

Merge removal of unneeded library calls

This is useful so that the package checks successfully in amdahl and moore.
Checked by myself (minor modifications).

Color bar

The addiction of the new parameter cex has been tested by Acacia Pepler and myself. If @vtorralba also agree to test it it would be nice.

Documentation corrections

Some corrections in the sample data documentation

Develop acc

Replacing MR !4
Already tested by Chloé

bugfixe: reverse order of the confidence interval, lower was in position 3 and higher was in position 1