Patch - addition to log implementaion

[Nabeel]

Hi,



AXIS2_F_LOG_DEBUG
AXIS2_F_LOG_INFO
AXIS2_F_LOG_ERROR
AXIS2_F_LOG_WARNING
AXIS_F_LOG_CRITICAL


All these takes similar set of arguments
(log,__FILE__,__LINE__,formated string)

e.g.:
AXIS2_F_LOG_INFO(log,__FILE__,__LINE__,"my info %s %d","test",1);

this would log
[info] xxx.c(nn) my info test 1

files in the patch:
modules/util/log.c
modules/util/axis2_log_default.h
include/axis2_log.h


TODO (suggestions): read log configuations from an xml file
            implement AXIS2_F_LOG_XML(log obj ,xml obj, formated string)


Thanks
- Nabeel

log implementation is updated to have the following methods. and these methods take variable number of arguments (work just like printf,sprintf, etc). now you don't need to do a sprintf to create the string and pass it to log write method. Pls review and commit if useful. (for performance reasons and convenience, instead of using a switch, seperate methods are written for different log levels) 3 booleans are defined to independently on/off debug/info/warning logs. (log_level parameter may be removed if we go for this scheme. AXIS2_LOG_WRITE macro works as it used to, but prints the file name and line number transparently. using a file descriptor instead of stderr (2) and keeping previous log when the app restarts

patch_log.tar.gz
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