Upstream version 1.4.16

"upgrade" and "deconfigure" targets produced an error until now

 change. Closes: #791275.

- Add Conflict/Replaces to the old package as necessary
- Adjust lintian override files as necessary

  - control: add intltool and autopoint to Build-Depends
  - rules:
      - use scim's bootstrap script for dh_autoreconf
      - enable clutter-immodule explictly, which is disabled by default
        in 1.4.15
  - patches: remove 03_backport_964b2221.patch, which is included in upstream

Upstream version 1.4.15

The man page was initially copied verbatim from the old scim-bridge-agent
package and subsequently adapted and fixed for problems.

differences to original scim-bridge man page:

- correct and improve the wording in some places
- remove whitespace at end of line
- drop and amend references to scim-bridge as necessary

Many thanks also to Tz-Huan for helping me fix a mistake I had
introduced.