Yet Another Shell

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Yet another shell, version 2.35.

This version of yash includes the new shell option "trace-all"
and some other fixes.

Yash 2.35

+ '--traceall' option.
+ New completion scripts for:
git-clean, git-grep, git-ls-remote, git-submodule,
git-whatchanged
+ Updated completion scripts for:
git-cherry-pick, git-rebase (Git 1.8.1.4),
ssh, ssh-add, ssh-keygen (OpenSSH 6.2)
= The condition for exiting the shell when the -e option is enabled
has been changed in accordance with the 2013 edition of
POSIX.1-2008.
= The "++" and "--" operators are no longer supported in the
POSIXly-correct mode.
= The $RANDOM variable now always returns random numbers, ignoring
the value from the environment variable, if any.
= If yash encounters a too long line that cannot be handled while
reading a history file, it now tries to keep reading the rest of
the file rather than stopping reading.
= Very long command lines are no longer saved in the history file.
* Minor fix in a syntax error message.
* Minor fix in completion script for "git", "ssh" and "rsync".

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