Improved the way ccache/distcc are used so that they can be enabled also
with the CTest launch rules.

Added the option GAUDI_USE_CTEST_LAUNCHERS to use launchers from ctest,
which produce XML reports about warnings and errors in a dedicated
directory under CMAKE_CURRENT_BINARY_DIR.

The use of the LOCATION property is deprecated and should be replaced
with the generator expression $<TARGET_FILE>, but the way we use it
requires CMake >= 2.8.12, so we must keep the old behavior until we bump
the cmake_minimum_required version.
(this policy have been defined in CMake 3.0)

Merge branch 'dev/cmake_lookup' into dev/cmake

* dev/cmake_lookup:
  added backward compatibility with old LHCb toolchain file
  modified InheritHEPTools to use GaudiToolchainMacros
  add InstallArea/${BINARY_TAG}/cmake to the search path
  factored out the default toolchain code and modified toolchain.cmake
  added tests on CMake modules to the default test suite
  add support for special conventions in projects lookup
  added ATLAS convention test for CMake lookup
  avoid that the cmake/tests directory goes in the list of packages
  made cmake_coverage.py executable
  renamed: FindUsedProjects.cmake -> GaudiToolchainMacros.cmake
  added functions to prepare search path from projects
  helper tools to test CMake modules
  minor change in a message

From an original idea of D. Quarrie.

Add the name of the package as label for the tests (for easier
grouping), and flag test-wrappers (like QMTest) with a label for easier
filtering hwne processing the XML reports.
It is also possible to use custom labels.

introduced some caching to avoid pointless recursion

https://its.cern.ch/jira/browse/LBCORE-495

* dev/cmake:
  allow overrides of LCG_externals_*.txt
  allow absolute paths in LCG_externals_*.txt files
  removed duplicated test
  fixed dependency of the <dictionary>PCM target
  fixed pcm support in CMake builds

From: Marco Clemencic <marco.clemencic@cern.ch>


git-svn-id: svn+ssh://svn.cern.ch/reps/gaudi/Gaudi/trunk@7505 53ecefc3-a64d-0410-9bdf-b8581fa3287e

All the LCG_externals_*.txt in the CMAKE_PREFIX_PATH (+ CMTPROJECTPATH, with
optional suffix dir LCG_<version>) are taken into account to fill the
CMAKE_PREFIX_PATH for the externals.

The first LCG_Externals_*.txt in the path overrides the content of the
following ones, and the last one is used to determine the base location of
the externals.

The custom command used for the <dictionary>PCM  target must depend on
<dictionary>Gen (and not on the pcm file) to avoid that the genreflex
command is called multiple times.

From: Marco Clemencic <marco.clemencic@cern.ch>


git-svn-id: svn+ssh://svn.cern.ch/reps/gaudi/Gaudi/trunk@7503 53ecefc3-a64d-0410-9bdf-b8581fa3287e

From: Marco Clemencic <marco.clemencic@cern.ch>


git-svn-id: svn+ssh://svn.cern.ch/reps/gaudi/Gaudi/trunk@7502 53ecefc3-a64d-0410-9bdf-b8581fa3287e

From: Marco Clemencic <marco.clemencic@cern.ch>


git-svn-id: svn+ssh://svn.cern.ch/reps/gaudi/Gaudi/trunk@7501 53ecefc3-a64d-0410-9bdf-b8581fa3287e

From: Marco Clemencic <marco.clemencic@cern.ch>


git-svn-id: svn+ssh://svn.cern.ch/reps/gaudi/Gaudi/trunk@7500 53ecefc3-a64d-0410-9bdf-b8581fa3287e

From: Marco Clemencic <marco.clemencic@cern.ch>


git-svn-id: svn+ssh://svn.cern.ch/reps/gaudi/Gaudi/trunk@7499 53ecefc3-a64d-0410-9bdf-b8581fa3287e

Merge branch 'JIRA/GAUDI-974'

* JIRA/GAUDI-974:
  Fixed logic of OutputStream::decodeAlgorithms.
  updated reference file after the changes in OutputStream
  wrap debug messages in "if(DEBUG)" conditions
  minor aestethic change in the debug messages
  fixed segfault when only AlgDependentItemList is defined
  allow nested test suites in GAUDI_QMTEST_DEFAULT_SUITE
  temporary: test for the conditional output in OutputStream (GAUDI-974)
  GAUDI-974: modified OutputStream to allow algorithm dependent outputs

Conflicts:
	GaudiPolicy/doc/release.notes

https://its.cern.ch/jira/browse/GAUDI-974

From: Marco Clemencic <marco.clemencic@cern.ch>


git-svn-id: svn+ssh://svn.cern.ch/reps/gaudi/Gaudi/trunk@7498 53ecefc3-a64d-0410-9bdf-b8581fa3287e

* dev/cmake:
  removed some dead code in ConfigurableDb.py
  modified UseHEPTools to pick up the system compiler on Ubuntu
  fixed dependency problem between generated headers and genreflex step

Conflicts:
	GaudiKernel/doc/release.notes

From: Marco Clemencic <marco.clemencic@cern.ch>


git-svn-id: svn+ssh://svn.cern.ch/reps/gaudi/Gaudi/trunk@7497 53ecefc3-a64d-0410-9bdf-b8581fa3287e