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The option inc_append_history already has the same effect.

This commit changes the history alias into a function which puts
the passed arguments before `-l 1`. It also provides a temporary
workaround to the lack of a `history -c` command in zsh.

For more information see issues 739 and 789.

More compact case statement instead of the ugly if elif... else
statement. Moves it to history.zsh

Revert PR #3359 as this is breaking stuff for many folks. Need to rethink how we handle system defaults differently on this

Especially given the inc_append_history option, it is not necessary to
set the (default) append_history option.

Especially given the inc_append_history option, it is not necessary to
set the (default) append_history option.

This is useful when you want to use a dangerous command, as it won't be
available with history searching.

Moving all zsh config options into a lib/ subdirectory to make way for some upcoming changes to directory structure and configuration options