process the scripts directory on non-Linux systems

Bash and Zsh completion can be useful on non-Linux systems too.
The generated debian/{postinst/prerm} do not hurt either.
add package name to description so it shows up in the ubuntu update manager
when handling a clone event and the parent thread is unknown, try to look it up.
Merge branch 'master' of github.com:draios/sysdig
bugfix: the main thread was not properly reset in sinsp_thread_manager::reset_child_dependencies()
a couple better checks in the clone handler
avoid looking up threads on proc if the thread table is full
remove_inactive_threads now notifies the caller when the pruning is actually happening
initial and incomplete support for filtering in the get_thread_table lua api call
the filter compiler is now able to validate if a filter is valid for scanning the thread table
lsof chisel now stops the capture at the first event it receives
sysdig.end_capture chiesl API call
set the proper m_lastevent_fd when doing filtering from get_thread_table
Merge pull request #219 from evgeni/non-linux-completion

process the scripts directory on non-Linux systems
a bunch more fd fields in the sysdig.get_thread_table() chisel API call
minor improvements in the lsof chisel
new chisel: ps
new chisel: netstat
memory and fd limits in the ps chisel
make sure to zero a couple of scap structures before using them