refactor attributes'value generator to deal with yams special Attribute/NOW/TODAY values that may be used on [Interval]BoundConstraint (BoundConstraint wasn't handled btw, fix this). Besides passing 'entity' to generate_* function (needed to get value for another attribute when computing one for instance): * set nicer method names and makes clearer what's private/protected/public * properly handle choices, constraints on float/date/datetime fields

[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