End up the Windows task before delete it.
Better handling of Windows versions and service packs.

WinVer.nsh allows to get information about Windows versions and service packs
easily.
New LogicLib expression 'IsTargetOsValidForWindowsTask'.

Check whether it's possible to use Windows Tasks in the target OS.
'SimpleSC::SetServiceDescription' is only available on systems higher than Windows NT.
Rename Windows task functions.
Rename Windows service functions.
Allow Windows Tasks depending on Windows version.
Windows service has preference over Windows task.
Rename constant EXECMODE_CURRENTCONF -> EXECMODE_CURRENT.
Start the execution modes with uppercase.
Improve data capture.

In the screen 'Choose Targets' set focus on the field 'Remote Targets'
whether both fields, 'Local Target' and 'Remote  Targets', are empty.

It makes that the data capture be faster because the 'Local Target' is
least used.

Suggested-by: Mario Jorge de Sousa Freire <mario.freire@camara.gov.br>
New quick installation mode in visual installation.

In the screen 'Choose Targets' now is possible select 'Quick installation' to
omit the rest of windows of options.

Suggested-by: Gonéri Le Bouder <goneri@rulezlan.org>.
Follow the FusionInventory Agent's pattern for version number.

Now FusionInventory Agent follows the CPAN compatible version number. See
commit fab504ef48afedd78517c08a2caa4c522f7a2740 of FusionInventory Agent for
more information.
Improve the help.