v1.13.0

GMT v1.13.0

Diff since v1.12.2

Merged pull requests:

• More fixes for the case when we are calling legend!(...) with configs only. (#1414) (@joa-quim)
• Change some variables default type to get better type stability. (#1415) (@joa-quim)
• UInt16 cubes can now be used too in imshow (#1416) (@joa-quim)
• Add logical +,-,|,&,xor operations to UInt5 and Boolean GMTimages (#1417) (@joa-quim)
• Let imagesc also have the stretch option. (#1418) (@joa-quim)
• Extend the grid algebraic operations to GMTimage as well. (#1419) (@joa-quim)
• Add a 'grays2rgb' function to compose three gray images into a RGB. (#1420) (@joa-quim)

Closed issues:

• gmtbegin & gmtend(:show) code block cannot embed figure in Jupyter notebook (#1402)
• Register v"1.12.1" (#1405)
• Different outcomes on specifying legends (#1406)