Fix linking with boost python

+ surprisingly boost python script from autoconf archive do not specify
  leading -l in @BOOST_PYTHON_LIB@ variable. Its needed to add it manually.
Add ax_check_icu m4 script

+ on squeeze this script is not included in autoconf-archive package so
  we need to bundle it in repo
Change required boost version to 1.42

+ on squeeze boost is in version 1.42 and it works:)
Refactoring in m4 scripts

+ move all scripts from acinclude to separate files in m4 directory
+ change from ACX_PHTREAD to AX_PHTREAD
+ include m4 directory in autogen.sh as primary scripts directory
+ bundle python and boost_python scripts cause they doesn't work on squeeze