do not fail if there is no ipv6
userspace/libsinsp/filter: make next_operand return vector<char>

Modify sinsp_filter::next_operand to handle operand which contains
the NUL terminator.
userspace/libsinsp/filter*: modify parse_filter_value to accept len

When the filter value is binary, we need to pass the length of the
value.
userspace/libsinsp/filter*: extend rawval_to_string to accept PT_BYTEBUF
userspace/libsinsp/filter*: evt.buffer return raw_value when m_is_compare
userspace/libsinsp/filterchecks: some refactoring
userspace/libsinsp/filter*: transform evt.buffer in PT_BYTEBUF
userspace/libsinsp: remove old code
avoid assertion when opening non existent /proc/net/(tcp|udp|raw)6 files
honour already set C(XX)?_FLAGS

that way we can pass additional flags from the build-environment
Change permissions
rename install-sysdig to install-sysdig.in so it's more obvious that people should not run this
Merge pull request #75 from lazy404/ipv6Fix

sysdig fails to start if ipv6 is disabled
Merge pull request #80 from evgeni/honour-cflags

honour already set C(XX)?_FLAGS
Skip a line from /proc/net/unix if the name contains bogus binary data. fixes #77
fix potential memory leak when invalid line is skipped
[53] Build for Solaris

Adds the necessary code splits for GNU make and SunOS -l flags into
the CMakeLists.

Changes the pragma rules for SunOS g++ (which do not support pop)

Also adds some minor include file preprocessor branches with __sun
tests.
Make access_ok work even when grsecurity is enabled. #76
[28] Complete quoting for parameters of some CMake commands

Adds quotes where applicable for variables inside of the CmakeLists
files
fix error message so that it is reachable and matches other checks in kernel driver