* src/debug.cpp, src/debug.h: New. Place for log functionality.
* src/common.cpp, src/common_indep.c, src/common_indep.h: Move out
debugging functions.
* src/keycache.cpp, src/mail.cpp, src/main.c,
src/mimedataprovider.cpp, src/oomhelp.cpp,
src/parsecontroller.cpp: Rename log_mime_parser to log data.