Explicit attribute accessor methods on settings objects

[seanpearsonuk]

Right now with settings objects, we can do stuff like

default_val = setting.get_attr("default")
allowed = str_setting.get_attr("allowed-values")

We also want:

default_val = setting.default_value( )
allowed = str_setting.allowed_values( )

Only the supported methods get created. So, default_value only
exists on properties; allowed_values only exists on strings and string lists,
and so on.

[seanpearsonuk]

Specific requirements

• all nodes (i.e. available in class Base just as is_active is now:
• • read_only (fluent name "read-only?")
• all properties and arguments (i.e. all classes such as Integer, ..., RealVector, ..., so inheritance might be the best solution, possibly via mixin)
• • default_value (fluent name "default")
• all strings and string lists (again using inheritance)
• • allowed_values ("allowed-values")
• all numerical values (again using inheritance)
• • min ("min")
• • max ("max")

[prmukherj]

Sean:

[seanpearsonuk]

#701