Removed old commented code
kernel coding conventions
sync tables
Removed old code related to poll()
Merge pull request #216 from dkogan/master

Log-rotation options (-C, -G and -W) had some issues so I'm disabling them
Don't reset preempt_count when opening a device, to prevent a race condition
Correct indentation
add the ability to undefine zlib in libscap
zlib was wrongly disabled
Fix more rare race conditions. Use a global mutex for all the open/close
Add a "verbose" module parameter that enables some extra logging (now disabled by default for Release builds)
typo
Remove obsolete --abstime option
a bunch more work on syslog
zlib was wrongly undefined
make sure sinsp_thread_manager::remove_thread doesn't bring the main thread reference counter below zero
completion no longer says which fields are FILTER-ONLY

The script uses that string to decide whether to complete on each event, so it
doesn't need to tell the user