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Reviewed-by: hjk

 * Fix all warnings about non-explicit constructors except for those
   in 3rdparty code.

This mainly allows for more precise shutdown and tightens the set
of allowed transitions.

Reviewed-by: hjk

on UNIX. Either set the LD_PRELOAD environment variable
using a gdb command or have the TermGdbAdapter set the
variable for the debuggee. For the remote adapter,
switch on toolchain. dlopen() is a fallback for
platforms where it is not supported and attaching
to running processes. Fixes a crash with gdb 7.0
(and spurious gdb 6.8 crashes with dlopen()).
Reviewed-by: hjk <qtc-committer@nokia.com>

this includes:
- move the gdb ownership back to the engine (thus strip down the
  adaptors as far as possible)
- make gdb startup synchronous
- make adapter shutdown synchronous
- fix the state transitions relating to shutdown

after refactoring the trk adapter startup, the split was not necessary
any more. in fact, it seemed fairly arbitrary at this point.

rename GdbResultRecord into GdbResponse
merge cookie QVariant into GdbResponse
move debugMessage convienience function from individual adapters to base

remove shutdownInferior()
rename shutdownAdapter() into shutdown()
remove errorString()
rename isAdapter() into isTrkAdapter()

remove shutdownInferior(), rename shutdownAdapter() into shutdown()