fix typo
doc: clean up docstring for SettingsManager
doc: minor tweak of interface doc
change cmd repeatability to be command prop and make move cmds non-repeatable
repeat complete command lines

furthermore, the special treatment of individual commands has been removed
fix: fix Command mechanism for move cmds in non-locked state
select commands no longer repeatable
Repeatability class property, mark more cmds as non-repeatable
rm offending line left over from self.repeatable instance property
changed repeatability default to False and reconsider repeatability of all Commands
Merge branch '0.3.4-fixes-commands-595-585'
add 'unattach' command for envelope mode
Merge branch '0.3.4-feature-unattach-218'
doc: autogenerate command docs
add ThreadBuffer.focus_last
make `move last` available if buffer allows it
make `G=move last` a global defaul binding
add TagListBuffer.focus_last
mention 'last' as parameter for `move` command

in autocompletion and help string
doc: fix Envelope.attachments docstring