Remove SVN $Id$ tags from source files which have been made
obsolete by moving to git and serve no purpose any more.
This mostly removes the matches printed by the command
git grep -E '\$[A-Za-z]+\$'
The remaining exceptions are some binary files (PDF and font files),
and jquery js files with both $Id$ and $Date$ tags.
* Change avrdude_message(MSG_XYZ, ...) to msg_xyz(...)
* Define and use pmsg_xyz(...) instead of msg_xyz("%s: ...", progname, ...)
* Review and change avrdude_message() levels
- Introduce new levels warning, error and ext_error
- Distribute info level to info, warning, error, ext_error
- Assign levels (more) consistently
- Unify grammar, punctuation and style of messages
* Use imsg_xyz() to print indented messages
* Show function name in errors and warnings on -v
* Reduce effective verbosity level by number of -q above one
