Migrate the 'panel' parameter to the new alias system

[seisman]

As the PR title says.

[Copilot]

Pull Request Overview

This PR migrates the 'panel' parameter from the old GMT parameter alias system to the new PyGMT alias system. The migration involves removing c="panel" from the use_alias decorator, removing c="sequence_comma" from kwargs_to_strings, adding panel=None as an explicit parameter, adding c=panel to the aliases documentation, and implementing the new AliasSystem with c=Alias(panel, name="panel", separator=",", size=2).

Key changes:

• Removes old-style panel parameter handling from 23 plotting functions
• Adds explicit panel parameters and new alias system implementation
• Updates one subplot utility function to use direct parameter processing

Reviewed Changes

Copilot reviewed 22 out of 22 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
pygmt/src/wiggle.py	Migrates panel parameter to new alias system for wiggle plots
pygmt/src/velo.py	Migrates panel parameter to new alias system for velocity vector plots
pygmt/src/tilemap.py	Migrates panel parameter to new alias system for tilemap plots
pygmt/src/text.py	Migrates panel parameter to new alias system for text plotting
pygmt/src/ternary.py	Migrates panel parameter to new alias system for ternary plots
pygmt/src/subplot.py	Updates set_panel function to use direct parameter processing
pygmt/src/solar.py	Migrates panel parameter to new alias system for solar plots
pygmt/src/rose.py	Migrates panel parameter to new alias system for rose diagrams
pygmt/src/plot3d.py	Migrates panel parameter to new alias system for 3D plots
pygmt/src/plot.py	Migrates panel parameter to new alias system for 2D plots
pygmt/src/meca.py	Migrates panel parameter to new alias system for focal mechanism plots
pygmt/src/logo.py	Migrates panel parameter to new alias system for GMT logo
pygmt/src/legend.py	Migrates panel parameter to new alias system for legend plotting
pygmt/src/image.py	Migrates panel parameter to new alias system for image plotting
pygmt/src/histogram.py	Migrates panel parameter to new alias system for histograms
pygmt/src/grdview.py	Migrates panel parameter to new alias system for grid view plots
pygmt/src/grdimage.py	Migrates panel parameter to new alias system for grid image plots
pygmt/src/grdcontour.py	Migrates panel parameter to new alias system for grid contour plots
pygmt/src/contour.py	Migrates panel parameter to new alias system for contour plots
pygmt/src/colorbar.py	Migrates panel parameter to new alias system for colorbar plots
pygmt/src/coast.py	Migrates panel parameter to new alias system for coastline plots
pygmt/src/basemap.py	Migrates panel parameter to new alias system for basemap plots

[seisman]

I'm considering if we should define a function like:

def common_alias(value, name):
    match name:
        case "projection":
            return Alias(value, name="projection")
        case "panel":
            return Alias(value, name="panel", sep=",", size=2)

then in wrappers, we can use it like:

from pygmt.alias import common_alias
aliasdict = AliasSystem(
    J=common_alias(projection, name="projection"),
    c=common_alias(panel, name="panel"),
)

so that we don't have to repeat alias(panel, name="panel", sep=",", size=2), in all wrappers.