poll: get_date: rename to parse-duration?

[Bruno Haible]

Hi Jim, all,

> If you make that change, please ensure that the transition
> definition is enabled only via the deprecated getdate module.

OK. So, assuming that there is a smooth transition, and that only
the transition module provides the old names, let's make a poll.

Who is in favour, who is against
  - renaming the module to 'parse-datetime',
  - renaming the header file from getdate.h to parse-datetime.h,
  - renaming the function from get_date to parse_datetime?

Bruno