Convert manage pages to Controller logic

[glensc]

Continuing #108, #117, #120 for manage/* pages

in the process, problems came up:

• email_alias.php delete action only handles last action delete status, fixed in 0f22d98
• some pages lacked role check, using manager now
  • check_email_settings.php
  • reminder_review.php
• some pages had wrong level since 09e31e2 (v3.0.4), fixed in 60866f8
  • custom_fields.php
  • customize_listing.php
  • email_accounts.php
  • general.php
  • issue_auto_creation.php
  • ldap.php
  • monitor.php
  • scm.php
• groups.php had unused $show_customer
• monitor.php radio boxes were broken (fixed in 7ddf30e)
• products.php had unused $user_options
• reminders.php html seems broken
• users.php some dead code?
• reminder_review.php uses bogus get_emails.tpl.html template, dropped (33693ea)

---

progress report:

• account_managers.php
• anonymous.php
• categories.php
• check_email_settings.php
• column_display.php
• customer_notes.php
• custom_fields.php
• customize_listing.php
• email_accounts.php
• email_alias.php
• email_responses.php
• faq.php
• field_display.php
• general.php
• groups.php
• index.php
• issue_auto_creation.php
• ldap.php
• link_filters.php
• monitor.php
• news.php
• partners.php
• phone_categories.php
• priorities.php
• private_key.php
• products.php
• projects.php
• releases.php
• reminder_actions.php
• reminder_conditions.php
• reminder_review.php
• reminders.php
• resolution.php
• round_robin.php
• scm.php
• severities.php
• statuses.php
• time_tracking.php
• users.php

[glensc]

@balsdorf ready for merge!