Move contacts source file from ~/me/contacts/nlist to ~/vault/contacts/nlist
In six.personname:
 - add PersonName.initials() method that deduces initials from known given
   names if initials not known
In six.expr:
 - fix bug in command-line "=keyword" parsing, introduced when command line was
   interpreted as encoded Unicode instead of ASCII
In 'six' script:
 - replace hard-coded data file path name with SIX_SOURCE env var
Fix header comment
Fix header comment, add AKA names to output
Alter doctests to use only ".utf8" locales
Improve commenting a tad
Add Person.email_address_name(), use in --report email output
Improve --report email output: always print Person names using
email_address_name()
In Person.email_address_name(), try the casual name before the full name
Add AKA names to --report=phone output for organisations
Bug fix: was creating duplicate Is_in links
Consolidate and sort all "with" and "in" clauses in --report=dump
Support 'with' and 'in' data clauses for Works_at relations, so that a person
acting as an agent for an organisation can be the contact point for another's
association with that organisation.
Allow unicode data IDs (not just ascii)
Dump residential addresses relative to local place
Add six.enum (copied from tpi.enum)
Upgrade to stackless 2.6.5
Add --report=dump --sort-mode option, implemented as sort_mode arg to
NamedNode.sort_keys()
Replace itext.new() with itext.__new__()