base_report_to_printer wrong import statement

[ViktorNagy]

your base_report_to_printer writes

from addons.base_calendar import base_calendar

but this raises an ImportError if someone specifies the addons_path as a list in server config file
the solution is to simply write

from base_calendar import base_calendar as every addons directory is added to the PYTHONPATH

the attached merge directive corrects this

[Lorenzo Battistini (elbati)]

Thanks for reporting.
Fixed with http://bazaar.launchpad.net/~domsense/domsense-agilebg-addons/6.0/revision/41
I hope sooner or later we won't need to use base_calendar anymore ( https://bugs.launchpad.net/openobject-server/+bug/837552 )