fix(dfns): multiple migration fixes

[wpbonelli]

• two records in different blocks with identically-named fields could bleed into one another
• integer fields that share a name between packagedata and another list record field (e.g. ifno in connectiondata, tables, period, ...) should be inferred as PK/FK pairs
• disambiguate LAK package number; previously either a lake number or an outlet number depending on which laksetting is active, split out separate lakeno/outletno fields to be unambiguous FKs