[docu] Updating changelog (fixing typos)

[doc] Updated Readme

[release] Bumping version to 0.4.1 (hotfix)

[pathsegmentstorage] Deleting copy constructor and assignment operato…

…r for PathSegmentDataStorage

[cmake] bumping version to 0.3.1 and adding OPENPGL_ prefix to cmake …

…options

[doc] Added disclaimer to the doc