Migrate the panel paramter in basemap

Author: seisman

pygmt/src/basemap.py

@@ -18,13 +18,14 @@
     Td="rose",
     Tm="compass",
     V="verbose",
-    c="panel",
     f="coltypes",
     p="perspective",
     t="transparency",
 )
-@kwargs_to_strings(R="sequence", c="sequence_comma", p="sequence")
-def basemap(self, projection=None, **kwargs):
+@kwargs_to_strings(R="sequence", p="sequence")
+def basemap(
+    self, projection=None, panel: int | tuple[int, int] | bool = False, **kwargs
+):
     r"""
     Plot base maps and frames.
 
@@ -40,6 +41,7 @@ def basemap(self, projection=None, **kwargs):
 
     {aliases}
        - J = projection
+       - c = panel
 
     Parameters
     ----------
@@ -84,8 +86,13 @@ def basemap(self, projection=None, **kwargs):
     {transparency}
     """
     self._activate_figure()
+
     aliasdict = AliasSystem(
         J=Alias(projection, name="projection"),
-    ).merge(kwargs)
+    ).add_common(
+        c=panel,
+    )
+    aliasdict.merge(kwargs)
+
     with Session() as lib:
         lib.call_module(module="basemap", args=build_arg_list(aliasdict))