Fixes #249 (Buster)

See merge request sympl/sympl!74

Update web/php/7.3/mods-available/sympl-web-lockdown.ini,...

See merge request sympl/sympl!72

Update web/php/7.3/mods-available/sympl-web-lockdown.ini, web/debian/changelog, web/debian/sympl-web.links, web/apache.d/zz-mass-hosting.ssl.template.erb, web/apache.d/zz-mass-hosting.template.erb, web/php/7.3/mods-available/sympl-web.ini files
Deleted web/php/7.0/mods-available/sympl-web-lockdown.ini, web/php/7.0/mods-available/sympl-web.ini files

Adjust group setting

See merge request sympl/sympl!70

Don't enforce the hostname, but warn on install script

See merge request sympl/sympl!66

Buster Issue248 - Exim permissions

See merge request sympl/sympl!64

# Conflicts:
#   mail/debian/changelog

Buster testing fixes

See merge request sympl/sympl!65

Issue243 default site

See merge request !61

Updated permissions for config/dkim

See merge request !59

Buster 190626

See merge request !54

Updated Sympl CLI

See merge request !52