Incorrect parameter in Figure.meca() #1094
Description
Description of the problem
Figure.meca defines an alias as C = offset. Based on the description of the offset parameter, I think this alias should be for the -A option in GMT's meca (https://docs.generic-mapping-tools.org/dev/supplements/seis/meca.html#a); -C is for giving a cmap for the compressive part of the beachball.
This is both a code and documentation issue, since there are these two checks for -C in kwargs (which should not be required for meca):
# Add in plotting options, if given, otherwise add 0s
for arg in plot_longitude, plot_latitude:
if arg is None:
spec.append(0)
else:
if "C" not in kwargs:
kwargs["C"] = True
spec.append(arg)
Relates to the proposed refactoring in #1002