Update to 5.18

Changelog:
2014-03-26  11:25  Christos Zoulas <christos@zoulas.com>

* release 5.18

2014-03-15  17:45  Christos Zoulas <christos@zoulas.com>

        * add fmtcheck(3) for those who don't have it

2014-03-14  15:12  Christos Zoulas <christos@zoulas.com>

* prevent mime entries from being attached to magic
  entries with no descriptions

* adjust magic strength for regex type

* remove superfluous ascmagic with encoding test

2014-03-06  12:01  Christos Zoulas <christos@zoulas.com>

* fix regression fix echo -ne "\012\013\014" | file -i -
  which printed "binary" instead of "application/octet-stream"

* add size_t overflow check for magic file size

2014-02-27  16:01  Christos Zoulas <christos@zoulas.com>

* experimental support for matching with CFD CLSID

2014-02-18  13:04  Kimmo Suominen (kimmo@suominen.com)

* Cache old LC_CTYPE locale before setting it to "C", so
  we can use it to restore LC_CTYPE instead of asking
  setlocale() to scan the environment variables.

(ryoon)