Control over -storage-field output directory name and location and other -sf odds and ends

[ruevaughn]

Please describe your feature request:

It would be very useful in my case to be able to control the directory that -sf or -store-field gets placed in. Currently it is statically chosen 'katana_field'. -sfd or -store-field-dir would do the trick, and would match the -srd syntax.

Having control over the naming of the files and whether they are globbed together or split out into individual files would be handy as well. Something like:

katana -sf url,qurl -sfd redacted.com -store-field-output glob
Would result in

>  ls -la redacted.com/
-rw-r--r--   1 user  staff   1807 Apr  2 11:48 all_katana_urls.txt
-rw-r--r--   1 user  staff     38 Apr  2 11:48 all_katana_qurls.txt 

And the original request would be something like:
katana -sf url,qurl -sfd $outputdir/urls
Would result in something like

> ls -la $outputdir/urls/
-rw-r--r--   1 user  staff   1807 Apr  2 11:48 https_fiveoclock.redacted.com_url.txt
-rw-r--r--   1 user  staff     38 Apr  2 11:48 http_redacted.com_url.txt
-rw-r--r--   1 user  staff     65 Apr  2 11:50 http_www.redacted.com_url.txt
-rw-r--r--   1 user  staff  65337 Apr  2 12:05 https_www.redacted.com_url.txt
-rw-r--r--   1 user  staff   7262 Apr  2 12:05 https_help.redacted.com_url.txt
-rw-r--r--   1 user  staff  10301 Apr  2 12:05 https_redacted.com_url.txt
-rw-r--r--   1 user  staff     90 Apr  6 08:33 http_fiveoclock.redacted.com_qurl.txt
-rw-r--r--   1 user  staff     43 Apr  6 08:33 http_proofs.redacted.com_qurl.txt
-rw-r--r--   1 user  staff     92 Apr  6 08:33 https_app.redacted.com_qurl.txt
-rw-r--r--   1 user  staff     50 Apr  6 08:33 https_auth.redacted.com_qurl.txt
-rw-r--r--   1 user  staff    325 Apr  6 08:33 https_fiveoclock.redacted.com_qurl.txt
-rw-r--r--   1 user  staff   1927 Apr  6 08:33 https_mpg-builder-redacted.redacted.app_qurl.txt
-rw-r--r--   1 user  staff  76736 Apr  6 08:33 https_www.redacted-factory.de_qurl.txt
-rw-r--r--   1 user  staff  27956 Apr  6 08:33 https_www.redacted.com_qurl.txt
-rw-r--r--   1 user  staff    141 Apr  6 08:33 https_www.redacted.com_qurl.txt
-rw-r--r--   1 user  staff   1193 Apr  6 08:33 https_www.redacted.com_qurl.txt
-rw-r--r--   1 user  staff    762 Apr  6 08:33 https_zookeeper.redacted.com_qurl.txt

Describe the use case of this feature:

I have a bash script that is using Katana, and I have to tailor the entire script around the fact that katana_field directory is output in the working directory that the script is in instead of just being able to specify it