cl/gcc-adapt-ext: legal notices for gcc adapter tests added or updated

Some of the tests are licensed under the GFDL v1.3 and CC BY-SA 3.0
licenses.  The test #33 (Compound literals) is not licensed by any
particular license, but the rights for the code belongs to FSF.
cl/gcc-adapt-ext: basic tests and support for C++ namespaced added

This includes one dummy test #06, which should be completed when C++11
support will be implemented.
cl/gcc-adapt-ext: C++ using declaration tests added

Using declaration test #03 has been added for future use.  It should
be run after the tests for 'struct', 'union' and 'class' namespaces
has been added and properly tested.
cl/gcc-adapt-ext: C++ using directive & namespace alias tests added
cl/gcc-adapt-ext: avoid SIGTRAP after handling METHOD_TYPE

Temporary solution provided by Kamil Dudka.
cl/gcc-adapt-ext: basic support for constructors & destructors added

This is actually support for processing of METHOD_TYPE node, which
might change in future. The RECORD_TYPE node is still unhandled.
cl/gcc-adapt-ext: namespace tests added to CL's test-suite

Support for namespaces should be completed now.
cl/gcc-adapt-ext: legal notices added to C++ tests in the test suite
cl/gcc-adapt-ext: access specifiers removed from test C++ n.12

... to avoid premature testing of access specifiers
cl/gcc-adapt-ext: inform about wrong handling of RECORD_TYPE

Related to issue #2 @ https://github.com/deekej/predator.
cl/gcc-adapt-ext: RECORD_TYPE in handled correctly now

Fixes #1 issue @ https://github.com/deekej/predator/
cl/gcc-adapt-ext: added conditional compilation for <cp/cp-tree.h>

Related to issue #2 ->> This header file's position is dependent
on the version of the GCC used, at is seems.
cl/gcc-adapt-ext: lvalue references tests added
cl/gcc-adapt-ext: 1st proposed solution to C++ references problem
cl/gcc-adapt-ext: C++ native boolean type tested
cl/gcc-adapt-ext: simple script for testing C++ tests added

Useful to check the test is written correctly before running it in
GDB. Deciphering the error message there can be pain in the a**...
cl/gcc-adapt-ext: functions overloading & default arguments tests added
cl/gcc-adapt-ext: constant expressions tests prior to C++11 added
cl/gcc-adapt-ext: default initialization test for C++ added

Issue #4 @ https://github.com/deekej/predator/ discovered here.
cl/gcc-adapt-ext: zero and value initialization tests added