made the pack completely portable and wrote relevent bat files to go with it

gitportable/mingw64/share/doc/git-doc/rerere-options.adoc

@@ -0,0 +1,9 @@
+--rerere-autoupdate::
+--no-rerere-autoupdate::
+	After the rerere mechanism reuses a recorded resolution on
+	the current conflict to update the files in the working
+	tree, allow it to also update the index with the result of
+	resolution.  `--no-rerere-autoupdate` is a good way to
+	double-check what `rerere` did and catch potential
+	mismerges, before committing the result to the index with a
+	separate `git add`.