3794182e05
basically, add a file named ~/.mu/bookmarks which looks something like
----
[mu]
testarch=subject:test maildir:/archive
inbox=maildir:/inbox
----
now, one can do a query, e.g.
mu find -b testarch
which is equivalend to
mu find subject:test maildir:/archive
if both a bookmark and a 'normal' search expression are specified,
the will be concatenated.
bookmarks starting with mu_ are reserved for mu itself.
The file is empty.