rsyslog work log 33

Past day's rsyslog work log: 2008-02-22 - integrated patch from Peter Vrabec to change the build process to produce imtcp.so and imgssapi.so from imtcp.c (in support of new gassapi input module) - many thanks, Peter! - applied patch by varmojfekoj to allow gssapi functionality to be build as a separate plugin (so that gssapi and plain tcp functionality can be individually distributed). Also inclulded some other enhancements, most importantly initial compatibility mode system - added some information on old-style config to ABNF (probably useful in getting us to a new config format) - fixed bug in duplicate module load detection - corrected config doc - IETF no longer intends to add facilities - updated compatibility notes doc - added some doc for imgssapi and imtcp input modules - completed initial vmstk implementation - begun implementing rsyslog virtual machine (vm class) - worked a bit on type conversion (specified the interface) - simplified var object, now only supports strings and numbers as a single type - worked a bit on var_t data type conversion 2008-02-24 - added some thoughts on RainerScript - worked a bit on conversion functions