Yet Another Shell

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Yet another shell (yash), version 2.19.

This version includes minor fixes.

Yash 2.19

+ The "ulimit" builtin is now available on FreeBSD.
+ In mail checking, the timestamp of the mail file is now compared
by the nanosecond if possible.
+ [line-editing] new line-editing commands:
oldest-history-bol, newest-history-bol, return-history-bol,
prev-history-bol, next-history-bol,
beginning-search-forward, beginning-search-backward
= Faster filename pattern matching.
= [line-editing] the "accept-line" command no longer accepts a
failing history search result.
= [line-editing] the following commands have been changed not to
move the cursor to the beginning of the line:
oldest-history, newest-history, return-history,
prev-history, next-history
The new commands whose names end with "-bol" provide the
previous behaviors.
* Fixed broken output of array assignment traces.
* [line-editing] the "vi-edit-and-accept" command now handles the
count.
* [line-editing] fixed the cursor position after the
search-again-forward/backward command in the emacs-like mode.

Legend:
+: new feature
=: specification change
*: bug fix