#1866: support e-hentai source redirection

* hopefully prevents error pages when the url during upload expires
* makes use of file sha-1 hash and filename in the url to query the e-hentai search page
* the file hash by itself is enough to generate a result but the filename is also added for completeness (the page displays the filename being searched)
* ip addresses, port numbers, and unix timestamps validation can also be added later
* a better solution maybe is to get the gallery ids and gallery tokens directly
Support new 4chan url format
update #1866 corrects first 3 octets

in the ip address
Revert "potential fix for #1210"

This reverts commit d5f10f41fd64543c6dbe9d7773f19b5c1dd8ac98.
fixes #1210
update install scripts
fix
#1866: support e-shuushuu source redirection

* currently, e-shuushuu already redirects some posts to their landing pages (http://e-shuushuu.net/image/?image_id=$id), particularly those ending in 'jpg'
* for some reason, e-shuushuu doesn't natively support other formats even the uppercased 'JPG'
* the following lines aim to address this issue to redirect to http://e-shuushuu.net/image/$id
* http://e-shuushuu.net/image.php?mode=view&image_id=$id is also a valid alternative but is not used
new version
fix bitpref references
#1866: support nijigen-daiaru source redirection

* brings the user to the front/1st page of the doujin similar when viewing manga in pixiv
fix for #2204
Revert "#2160: hide remove links unless builder"

This reverts commit 901aa1264c6a95b355d2677d60c2166cc69718c7.
Revert "fixes #2160"

This reverts commit 292f7309914f0b515d34791b57fedeaa01e747f2.
new version
use traditional method for clearing bits
fixes #2206
new version
#1866 support for rule34.paheal.net

note: rule34.paheal.net runs shimmie
indent