Reverted previous three changesets (e09139525580, 85517c8fde36, 3acbff727626)

Modify userinfo output to indicate when domain defaults are displayed When Account instances reference NULL tid/qid/ssid, the data must come from the associated domain, and this should be indicated. For transport and services, this is easy to do as the string passed in the info dict can simply be modified. For quotalimit, however, another method must be used due to the CLI-side formatting. All approaches use a common formatter outsourced to the common.py file.

Modify Account class to handle NULL references This patch modifies the Account class to defer to using the associated domain's tid/ssid/qid fields if the per-instance fields are None/NULL.

Modify SQL update script to accept NULL fields for users The value NULL in the qid/ssid/tid fields of the user table means that the value from the associated domain record should be used instead. This patch modifies the PL/pgSQL functions used by Dovecot and Postfix accordingly.

Add list* subcommands to TODO

add domain/account notes to TODO

Add my WIP items to the TODO list

Cache interpolated destination Instead of running the string modification function for destination interpolation twice, store the result once and use the stored result subsequently.

man: Use example.com in catchallinfo example output.

README: reStructuredText fix: ERROR/3 and WARNING/2.