Initial data commit

Task/Copy-a-string/Maxima/copy-a-string.maxima

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+/* It's possible in Maxima to access individual characters by subscripts, but it's not the usual way.
+Also, the result is "Lisp character", which cannot be used by other Maxima functions except cunlisp. The usual
+way to access characters is charat, returning a "Maxima character" (actually a one characte string). With the latter,
+it's impossible to modify a string in place, thus scopy is of little use. */
+
+a: "loners"$
+b: scopy(a)$
+c: a$
+
+c[2]: c[5]$
+
+a;
+"losers"
+
+b;
+"loners"
+
+c;
+"losers"