misc/lnav: Attempt at log format description for lnav The default lnav behavior often misidentifies messages with the word 'error' as errors, even in debug messages. This solves that.

This module blocks configured queries that change server state.

E.g. to make vCard storage read-only:

``` lua
readonly_stores = {
	vcard = { "vcard-temp", "vCard" };
}
```