Guile multimap example fix for 64 bit systems
Rework perl5 compiler and linker flags

This fixes perl on cygwin. Probably on other platforms too.
Cosmetic on unknown javac version display
Guile doc sections update
Add more references about the SWIG license to the legal.html website page

Also add in references to the release notes.
Move installation and install check instructions from README to Preface section in the documentation.
Fixes looking for Guile in configure.ac
Fix tcl operator example crashing when run

The example was accessing deleted memory and so sometimes crashed.
Fix li_std_containers_int test case for Python < 2.6

Workaround bugs in older versions of Python