Adds immediate migration results

qt6-after/qt6-migrated-legatus/include/GeographicLib/share/man/man8/geographiclib-get-gravity.8

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+.TH geographiclib-get-gravity 8 "" GeographicLib GeographicLib
+.SH NAME
+geographiclib-get-gravity \-\- a GeographicLib administrative tool
+.SH DESCRIPTION
+.B geographiclib-get-gravity
+downloads and installs the gravity datasets used by GeographicLib,
+<https://geographiclib.sourceforge.io>.  For documentation, supply the
+.B \-h
+option:
+.PP
+    geographiclib-get-gravity \-h
+.PP
+By default, the datasets are installed in
+.I /usr/local/share/GeographicLib/gravity
+and the script requires write access to this directory.