- new log4j naming conventions: category -> logger
- multiple appenders per category
- improve errors in configuration file parser
- location_info is broken (need macro ?)
- remove initialization of log4c when library is loaded (compatibility
  issues)
- add void* to location_info
- thread safe ...
- use expat ?
- distribute msvc6 and macosx build files
- improve sd/error.c
- docs needs an update