add password-store package

Although it does not work when fish is the default shell.
Also, yasnippet has been automatically added again.
Clean perltidy calling code and docs
Delete a word, delete line left of the cursor
Correct join lines documentation
Finetune restore-desktop
expand-region and documentation

Old and unused 'select text within quotes' is removed. expand-region
does it all. C-= is the key.