Added ensure-string and substitute-strings.

Author Pascal J. Bourguignon <pjb@informatimago.com>
Author date 2018-07-17 12:17:03
Author local date 2018-07-17 14:17:03 +0200
Committer Pascal J. Bourguignon <pjb@informatimago.com>
Committer date 2018-07-17 12:17:03
Committer local date 2018-07-17 14:17:03 +0200
Commit 186f8073e5784ee90bd12feb30ea25b24cacfa4b
Tree a16040f995086a28b2b6dcaf9ab163762e3c84dd
Parent f254336a92497fec0900b8088c55f71c113f4ab4
Added ensure-string and substitute-strings.
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