Bootstrapped Doxygen documentation in evalresp with new doc/Doxyfile, src/evalresp.h, and doc/intro_dox.h. Updated Makefile.am with build targets.
Added Doxygen skeleton to evresp.h for evalresp private interface. File should be evalrespP.h.
Added Doxygen docs to evr_spline.h for evalresp cubic spline interpolation interface and adapted existing comments. File should be evalresp_splineP.h.
Updated log.h, log/to_file.h, and log/to_syslog.h with new Doxygen docs structure for evalresp private logging interface. Files should be logP.h, to_fileP.h, and to_syslogP.h.
Added Doxygen skeleton to regexp.h for evalresp private regular expressions interface. File should be regexpP.h.
Added Doxygen skeleton to regmagic.h for evalresp private regular expression interface. File should be regmagicP.h.
Skipped spline.h as it is borrowed external library code.
Added Doxygen skeleton to x2r.h, x2r_log.h, x2r_ws.h, and x2r_xml.h. Files should be {x2r,x2r_log,x2r_ws,x2r_xml}P.h.
Added bootstrap "FIXME" brief description to all undocumented objects.
Added bootstrap "FIXME" descriptions to undocumented structure attributes.
Transformed some plain comments to Doxygen documentation comments in evresp.h.
Used some information from Google Docs "Evalresp functional inventory" to improve Doxygen documentation.
Documented some FIXMEs structs, struct elements, and macro constants in evresp.h.