Make some columns required

[Pl217]

• Admin command delete-broken-attachment developed for HPC-9832 has deleted attachments which had their planId column equal to NULL before, so we can make this column required now, as there is no data anymore which made it accidentally optional
• In organization table, there are no records where abbreviation is NULL, so we can make it required now. In the old dumps, the organization with ID 1585, named "Kraft Foods Foundation", didn't specify abbreviation and there may have been others too, but all records have non-null abbreviation now