- Added an alterantive search path for WiX components
- Added a custom welcome dialog to include the copyright line (Bug#59805 and Bug#59512)
- Excluded some binaries to make package smaller, in effect makig the
  "essentials" package obsolete
- Added a bit more error checking when running the WiX tools

WiX XML changes done by Johannes Taxacher

Fix some issues with WiX packaging, particularly 
major upgrade and change scenarios.

* remember binary location and data location
(for major upgrade)

* use custom UI, which is WiX Mondo extended 
for major upgrade dialog (no feature selection
screen shown on major upgrade, only upgrade
confirmation). This is necessary to prevent
changing installation path during upgrade
(services are not reregistered, so they would 
have invalid binary path is it is changed)

* Hide datafiles that are installed into 
ProgramFiles, show ones that are installed
in ProgramData

* Make MSI buildable with nmake

* Fix autotools "make dist"




Makefile.am:
  Fix autotools "make dist"
configure.in:
  Fix autotools "make dist"
packaging/Makefile.am:
  Fix autotools "make dist"
packaging/WiX/CMakeLists.txt:
  Use custom UI, for major upgrades
packaging/WiX/CPackWixConfig.cmake:
  Show user editable datafiles in feature selection dialog, 
  not datafiles installed into ProgramFiles directory
packaging/WiX/create_msi.cmake.in:
  Use custom UI, fix nmake build for installer
packaging/WiX/custom_ui.wxs:
  Use custom UI
packaging/WiX/extra.wxs.in:
  Show user editable datafiles in feature selection dialog, 
  not datafiles installed into ProgramFiles directory
packaging/WiX/mysql_server.wxs.in:
  Remember install locations of binaries and 
  user editable datafiles.