Read multiple strings in the minibuffer, with completion.
By using this functionality, a user may specify multiple strings at a
single prompt, optionally using completion.
Multiple strings are specified by separating each of the strings with
a prespecified separator character. For example, if the separator
character is a comma, the strings 'alice', 'bob', and 'eve' would be
specified as 'alice,bob,eve'.
The default value for the separator character is the value of
`crm-default-separator' (comma). The separator character may be
changed by modifying the value of `crm-separator'.
Contiguous strings of non-separator-characters are referred to as
'elements'. In the aforementioned example, the elements are: 'alice',
'bob', and 'eve'.
Completion is available on a per-element basis. For example, if the
contents of the minibuffer are 'alice,bob,eve' and point is between
'l' and 'i', pressing TAB operates on the element 'alice'.
The return value of this function is a list of the read strings.
See the documentation for `completing-read' for details on the arguments:
PROMPT, TABLE, PREDICATE, REQUIRE-MATCH, INITIAL-INPUT, HIST, DEF, and
INHERIT-INPUT-METHOD. (fn PROMPT TABLE &optional PREDICATE REQUIRE-MATCH INITIAL-INPUT HIST DEF INHERIT-INPUT-METHOD)