`ipbb add symlink` always creates absolute links

[thasti]

When using ipbb add symlink like so:

ipbb add symlink ../ipbus/ipbus-firmware

The symlink in the src directory will still be created as an absolute link. This is less than ideal, especially when sharing the project setup within e.g. a git repository.

A manual workaround is to just cd src/ && ln -s ../ipbus/ipbus-firmware ipbus-firmware manually, which seems to do the same and work just fine. Would be nice if the add symlink command would respect the path given, or at least offer an option to do so.