btparse from home:j-engel project

For openSUSE Tumbleweed run the following as root:

zypper addrepo https://download.opensuse.org/repositories/home:j-engel/openSUSE_Tumbleweed/home:j-engel.repo
zypper refresh
zypper install btparse

For 15.5 run the following as root:

zypper addrepo https://download.opensuse.org/repositories/home:j-engel/15.5/home:j-engel.repo
zypper refresh
zypper install btparse

For 15.4 run the following as root:

zypper addrepo https://download.opensuse.org/repositories/home:j-engel/15.4/home:j-engel.repo
zypper refresh
zypper install btparse