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This makes the qemu run button appear/ disappear once we add a maemo
target to an existing project.

Reviewed-by: Tobias Hunger

No longer set EPOCDEVICE as it causes an error in createpackage.
Remove obsoleted code calling signis.exe and package file rewriting.

 ... otherwise we might leak memory

 * Fixes update of Qt version name whne renaming a Qt version.

 * We get a bogus Qt imported otherwise

 * Not good, but better than ASSERTing/crashing later on.
 * Use a qWarning to provide some hint on what is going on.

 * Add qWarnings on failures.

  ... when simulatorPath is unset.

 when presenting them in the new project wizard.

 * When creating a new project for some device: Set UI element size
   to the device resolution.

- Prepare usage of 'make sis' target for GnuPoc.
- Change the package names to '_unsigned.sis', '.sis'
  instead of using '.sisx' for signed, adding accessors
  to S60DeviceRunconfiguration.
- Determine the local executable file name from the
  package template for GnuPoc (as it is no longer
  located under the SDK tree).

Move code to locate gcce from S60Manager to CCE toolchain and make it
handle empty GCCE-root's correctly (locate compiler in path and
warn if none found). Set up environment correctly.

- 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