Changes:
* run_c_code() is replaced by check()
* nice_path() got removed, and is replaced by bldpath()
* check_compilation_flag() is updated to work with 1.8 API
Clang packages in Debian are sometimes broken. In that case, compiler fails
with "fatal error: 'bits/c++config.h' file not found". We should detect that
better. This patch updates boost.py to latest waf version which works, and also
handles empty apsican variable.
This is a massive upgrade removing almost all pre-waf 1.6 script code. In addition, this does away with custom pkgconfig.py script for making .pc files and replaces it with waf's builtin mechanism.
Massive thanks to Alex Afanasyev for ideas and bugfixing, to Alina Quereilhac for bugfixing and testing, and to Tom Henderson for thorough testing.
