- Autodetect SDK by environment variable EPOCROOT and qt directory
below.
- Environment::appendOrSet/prependOrSet: Avoid duplicate entries
- Rename toolchain enumeration value
- Adapt S60ToolChainMixin to new GnuPoc setup, provide routines for
  all required variables.
- RVCTToolChain: Make RVCT detection smarter (Check for RVCT<v1><v2>BIN
  variable). Set all required variables in case of RVCTToolChain/GnuPoc
- QtVersionManager: Detect toolchain and Qt version properly, make S60
  device run config accept toolchain.
- Modify S60DeviceRunControl to execute 'make sis'
- Modify S60Devices::detectQt...() to check for Qt installed into SDK
  first and symlink as fallback.

 when not set to true in the .user-file.

 * Remove default Qt version from list of available versions

And port the Qt4ProjectManager to use that API for synchronization
between editors and the .pro file tree.

Reviewed-By: con

 * Accidentally included a header not ready to commit yet.

 * Fixes RunConfigurations not updating when changing something
   in the BuildConfiguration.

Reviewed-by: dt

 * Do not use the BuildManager but have the qmakestep trigger
   the update via the target and project.

Reviewed-by: dt

Reviewed-by: dt

 * Initialize it to the toolchain used, not the preferred one

  ... in Qt Options page.

 * Update the import label (and related stuff) whenever the
   project was rebuild.

suppressing the "~QX11PixmapData(): QPixmap objects must be destroyed
..." warning.

...making use of a shared device by all clients. Detect device removal by
delaying the WM_DEVICE event handling. Introduce Acquire/Release mechanism
to SymbianDeviceManager and let acquire() fail if the device is in use, thus
preventing starting 'run' while debugging is active, etc.
Handle "Device removed" (unplugging of cable) signal by closing the device and adding
handlers to the clients, stabilize TrkDevice against it.
Remove communication type from the run configuration parameters (now handled by
SymbianDeviceManager).

Working towards keeping the Trk-connection always open and a giving the target pane
a meaningful tooltip.
For the moment, pass on tooltips from device manager additional information
(Trk version and such as determined by the launcher).

Since the target names are translated, we cannot use the saved
display name from the user file.

Reviewed-by: Tobias Hunger

 * This is necessary as the decission on whether Symbian support
   is available at all depends on the ToolChain used to build.
   We should improve this!

thus fixing the exit warning:
"~QX11PixmapData(): QPixmap objects must be destroyed..."

Acked-by: con

Use that for showing details about connected Symbian devices.
Also update the icon with an (not-)connected overlay icon.
Graphics design pending.

 * Ease cross device development by introducing 'targets' which
   group build- and runsettings that are valid for this one target

 Most of the kudos for the code review go to dt. Con, thorbjorn,
 ckandler and others did also review parts of this patch.

Reviewed-by: dt

Depending on the Qt version we might be able to gather the qemu path,
if not the former error message was a bit misleading.

the last step was moving the statics to a common class which is
initialized at startup.