v2.1.0

Features

• Add copy_shallow to all objects. (376f08f)
• • Add discrete_{x,y} flags to variables. (2b97da5)
• Refactor docs. (343210c)

Fixes

• Fix variable get_full_y_title. (31dcbc1)

Breaking changes

• Rename log_{x,y} and discrete_{x,y} attributes of Variable. (ead2d20)