Show user search box when adding a new user

Link to org & user landing pages & kill pjax on internal pages

Show auxiliary data for the organization at the end

We're sticking with user for now until 2.0

On validation errors, `$faq` will be set to something non-null, like
`false`, but will not be an instance of a Faq article.

For PHP installations that have `mbstring.func_overload` enabled (set to a
value including `2`), the `strlen` function will be overloaded to use the
`mb_strlen` equivalent. Problematically, the internal encoding of `UTF-8`
will be applied to all file content, which will count UTF-8 characters
rather than bytes. This will cause the data to be saved correctly; however,
the `size` recorded in the %file table will be recorded incorrectly.

This patch allows the backend to report the size of the contents saved with
the request and provides a failsafe mechanism which will use the mbstring
equivalent if available, and the mbstring version is coded to use the `8bit`
as the encoding which will prevent reading characters.

References:
https://github.com/osTicket/osTicket-1.8/issues/552

Show auxiliary data for the organization at the end

Basic search is now limited to ticket number, email address and name.

Disable email alert sent to admin when a warning is logged due to ticket
rejection e.g when banned email or max open limit is reached.

- Add tips for fields that were previously overlooked.
- Fix some typos.
- Update tips to adopt the formatting conventions of tips.

- Proofread large portion of help tips.
- Implement help tip links in YAML files.
- Fix GUI spacing of some elements.
- Add <label> tags to a few form elements.

  * Drop _table_ titles
  * Drop _button_ titles and contents
  * Fixup titles to remove leading and trailing underscores in titles
  * Remove duplicated namespaces for ticket queue pages
  * Whitespace cleanup

Provide quick prints options that bypasses the print dialog modal

If a client initially authenticates with an external source such as Google+,
the user should still have the ability to set a password via the password
reset mechanism.

Don't show user search box, when adding a new user, if the system don't have remote directories installed