Move functions related to index maintenance to separate source file.

Heikki Linnakangas <heikki.linnakangas@iki.fi>

Commit: 62420ae7d6675453a48e408b62030b6f0780e878
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2015-04-24T06:33:23Z
Releases: 9.5.0
Move functions related to index maintenance to separate source file.

There is enough code here to deserve a file of their own, not be buried
in the middle of execUtils.c.

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