Use std::to_string instead of boost::lexical_cast.
Get rid of some 'unused parameter' warnings.
Increase jail memory from 200 to 500 mbyte.
Only support x86_64 and bump some dependency version requirements.
Also bump memory limit in testsuite.
#include <forward_list>
Remove _GLIBCXX_CONCEPT_CHECKS from default compile-config.
Do not include <linux/ptrace.h>

<linux/ptrace.h> conflicts with <sys/ptrace.h> on recent
toolchains and including the former is enough.

In file included from Ptrace.hsc:10:0:
/usr/include/linux/ptrace.h:58:8: error:
redefinition of ‘struct ptrace_peeksiginfo_args’
 struct ptrace_peeksiginfo_args {
        ^
In file included from Ptrace.hsc:9:0:
/usr/include/sys/ptrace.h:191:8: note: originally defined here
 struct ptrace_peeksiginfo_args
        ^
Prelude: cleanup compile warnings about unused variables
Merge pull request #4 from jpnurmi/prelude

Prelude: cleanup compile warnings about unused variables
Merge pull request #3 from jpnurmi/ptrace

Do not include <linux/ptrace.h>
Use seccomp.
Replace illegal UTF-8 output sequences with a replacement character.
Clean up running of stages a little bit.
Move BARK implementation (and its Boost.StringAlgo dependency) out of precompiled header.
Remove the never used del_ostream.
Remove tag functionality (and Boost.Variant dependency) from tracked.
Remove Boost dependency from type_strings.hpp.
Remove Boost dependencies from more_ostreaming.hpp.
Remove a bunch of Boost includes that nobody uses and that blow up the PCH size considerably.