Add Ref::get_path_with_basepath_setting()
Add Ref::get_path_with_basepath_setting()

This function can be used to override the basepath setting from the
header of the entry so that another basepath is used for looking
up/constructing the actual filepath.

This might come in handy at some point.

Signed-off-by: Matthias Beyer <1d6e1cf70ec6f9ab28d3ea4b27a49a77654d370e@beyermatthias.de>

matthiasbeyer/imag,matthiasbeyer/imag