Allow bookmark deletions
Repositories imported can contain bookmarks (see #143 (closed)) and since they are protected, they are not going to move. It is quite inconvenient, especially for bookmarks as meaningful as master.
https://foss.heptapod.net/fluiddyn/fluidsim/branches
I'd like to delete the bookmark master, but:
pierre@kth ~/t/fluidsim> hg bookmarks
master 1264:e37c77fc8020
pierre@kth ~/t/fluidsim> hg book master -d
pierre@kth ~/t/fluidsim> hg bookmarks
no bookmarks set
pierre@kth ~/t/fluidsim> hg push -B master
pushing to ssh://hg@foss.heptapod.net/fluiddyn/fluidsim
searching for changes
no changes found
remote: Creating or updating bookmarks is forbidden by default in Heptapod. See https://heptapod.net/pages/faq.html#bookmarks to learn why and how to partially lift that restriction
abort: push failed on remote