WIP2: index user headers

David Bremner david at tethera.net
Sat Mar 2 07:41:26 PST 2019

This obsoletes [1]
This is getting closer to mergable, but it still needs at least to
sanity check the names of user defined prefixes (see point (a) below).

The main differences from [1] are

(a) xapian prefixes are no longer defined via upper casing, as this is
    locale dependent. The do rely on a ":" separator, hence the need
    for some sanitization.

(b) The caching of user header/prefix information is now done via
    string maps, and used more effectively during indexing.

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