trivial: update links in comments and config to https where available

[johndoh]

for #9756

for most links just changing http to https is enough. there are couple where there were redirects in place so i changed the URL to match the "real" one. And there are a handful of dead links:

• ./plugins/managesieve/lib/Roundcube/rcube_sieve_engine.php
  • http://wiki.kolab.org/KEP:14#USER
• ./plugins/password/drivers/ldap.php
  • http://phpldapadmin.sourceforge.net/
• ./plugins/password/drivers/ximss.php
  • http://www.communigate.com/WebGuide/XMLAPI.html
• ./plugins/password/password.php
  • http://phpldapadmin.sourceforge.net/
• ./config/defaults.inc.php
  • http://orangoo.com/labs/?page_id=72
• ./program/js/common.js
  • http://idn.icann.org/E-mail_test
  • http://dev.rubyonrails.org/changeset/7271
  • http://www.michaelapproved.com/articles/timezone-detect-and-ignore-daylight-saving-time-dst/
• ./program/lib/Roundcube/rcube_html2text.php
  • http://www.dar.dar.lt/
• ./program/lib/Roundcube/rcube_imap_generic.php
  • http://ilohamail.org/
• ./program/lib/Roundcube/rcube_tnef_decoder.php
  • http://webcheatsheet.com/php/reading_the_clean_text_from_rtf.php
• ./program/lib/Roundcube/rcube_utils.php
  • http://downloads.securityfocus.com/vulnerabilities/exploits/26800.eml
  • http://blogs.sitepoint.com/2009/05/01/interactive-cli-password-prompt-in-php/