For USDT arguments of the form "-4@$-1", the parsing logic would fail
because it didn't expect the second number (the actual value of the
USDT argument as a constant) to be negative. This is now fixed.

IPv6 strings with an inet6_ntoa

Replaced `which --skip-alias` with `ProcUtils.which`

Support for global variable arguments in USDT probes

Lua Tools for BCC

Percpu support

I previously thought it wouldn't be possible to probe arbitrary user-mode addresses,
but it turns out that it is. This was required to support global variable arguments
in USDT probes. For example, there are a few probes in libpthread whose arguments
refer to the mp_ global variable. These are now supported.

Additionally, refactored process-related utils into a ProcUtils class in procstat.py,
and implemented a version of `which` (`ProcUtils.which`) that is as portable as
possible -- it only relies on traversing the PATH environment variable.

changed pc_hash/array to percpu_hash/array

table.py
optimised/fixup table.py code based on Brenden feedback

test_percpu.py
Now tests are processor aware and doesn't use sleep
added new line at the EOF

solisten: clean endian conversion hack

Merge remote-tracking branch 'origin/master' into percpu

removed kernel checks.

Minor endian and debug enhancement

argdist, trace, and tplist support for USDT probes