Allow default attributes to be set via config and cmdline
This commit changes the default attribute list from a fixed '*'
to a configurable list, defaulting to ['*'].
It allows one to use config file or command line to set default
attributes to retrieve and display - i.e. to set default attributes
to '+' or to a list of multiple specific attributes.
Printing or changing this value through env/setenv is currently not
supported because env/setenv only work properly with string values
while attributes is a list.
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