Changes since tag 1.8.1

commit 8e81aaa7f35a2f2f1adf7690850b1b395e8f63a2
Author: Hendrik Leppkes <h.leppkes@gmail.com>
Date:   Wed Feb 20 14:10:48 2019 +0100

    Update TOC to 8.1

commit c512eca840846d4be1812f81f461837ab72c0696
Author: Hendrik Leppkes <h.leppkes@gmail.com>
Date:   Wed Feb 20 14:10:28 2019 +0100

    Fix position of Mapster options button

commit 09f4095ac644e8a192aa152ceedd884531799efc
Author: Hendrik Leppkes <h.leppkes@gmail.com>
Date:   Tue Aug 21 11:51:28 2018 +0200

    Cleanup a few upvalues

