- add mu4e-toggle-logging to enable/disable logging
- add mu4e-show-log to view the log buffer, and bind it to '$' in the
main/header/view buffers
- add a note about it to the doc (mu4e.texi)
- make mu4e-log the the new logging function, use colors to distinguish
incoming/outgoing data
- only keep last 1200 lines of log in the log buffer
- mu4e-main.el: mu4e-update-mail-show-window retrieves mail / updates
database, show output in split window (actual work is done by...:)
- mu4e.el: mu4e-update-mail retrieves mail, updates database,
asynchronously. Optionally, show output in a buffer
when `mu4e-update-interval' is non-nil and some integer, it calls
mu4e-update-mail every so many seconds.
- mu4e.texi: document this
- TODO: updated