Improve metrics window word lists.

* final line munge                              [??]
* input box should be raw text from file.       [ok]
* thus entered text can include slash codes     [ok]
* selection with square brackets slight off        <- still not 100%
* add "add word list..." to metrics/file menu   [ok]
* view menu should have next/prev line in word list with hotkeys. [ok]
Merge pull request #780 from monkeyiq/2013sep/issues/651_s19

Improve metrics window word lists.