Vcs: Do not leak parameter widgets

Executing a parameter widget command calls a diff() or log()
of VcsBaseClient. The editor already existed, but
parameter widget is always created (call to setConfigurationWidget()
will be ignored in this case) - and parameter widget gets leaked.

Change-Id: I25591d5a54b80fed25ff11ce26108882c421e9fc
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
Debugger: Add a few 'unused' to auto tests

Spoils the optimizer's fun a bit.

Change-Id: I3321d6c1fb75a9ecc6e603422116636c3c6cc4c2
Reviewed-by: hjk <hjk121@nokiamail.com>
Debugger: Add a README on how to handle the dumper auto tests

Change-Id: Ic14ab793369fd5fb5649dac6518152bcbfa5ac29
Reviewed-by: hjk <hjk121@nokiamail.com>