[CWEP002] properly handle serialization of computed attributes
Until this cset, only serialization of computed attribute's formula was
handled (thanks to the relation definition's properties dict).
We now:
* properly serialize/deserialize attribute's formula
* test first if the database has been migrated and contains related
column or not
Related to #3546717
[MESSAGES CONTROL]
disable-msg = C0301
[VARIABLES]
# Enable / disable this checker
enable-variables = yes
additional-builtins = _, display_name
[BASIC]
required-attributes=
attr-rgx = (w|[a-z_][a-z0-9_]{2,30})
variable-rgx = (w|[a-z_][a-z0-9_]{2,30})$
argument-rgx = (w|[a-z_][a-z0-9_]{2,30})$
[TYPECHECK]
generated-members=debug,info,notice,warning,error,critical,exception