Qt4: add route to 'SIGNAL' service

Fixes #617.
Increase signal handler stack size

Fixes #616.
Arora demo: make Nitpicker plugin work

Fixes #620.
base: enable rm_fault test case for nova

Related to #621
nova: recall thread if exception can't be resolved

Recall faulting thread and block pager thread. The pager get resumed as soon
as the fault gets resolved by the rm_session (or never ever).

Fixes #621
Increase quota of d3m
libc_lock_pipe: implement F_GETFL 'fcntl()' command

Fixes #622.
Arora: disable 'not implemented' messages

This patch disables the '_sigprocmask called, not implemented' messages.

Fixes #623.