Closes Homebrew/homebrew#42851.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

Remove more logs, use the prune time period and remove version control
checkouts when --force or --prune is used.

Closes Homebrew/homebrew#42892.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

Closes Homebrew/homebrew#42890.

Signed-off-by: Xu Cheng <xucheng@me.com>

Since they won't have been installed into `#{HOMEBREW_PREFIX}/share/emacs/site-lisp/`

Closes Homebrew/homebrew#42839.

Closes Homebrew/homebrew#42800.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

Closes Homebrew/homebrew#42507.

Also:
* one minor regexp tweak

Closes Homebrew/homebrew#42761.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

Closes Homebrew/homebrew#42806.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

Closes Homebrew/homebrew#42814.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

Closes Homebrew/homebrew#42805.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

Closes Homebrew/homebrew#41858.

Signed-off-by: Baptiste Fontaine <batifon@yahoo.fr>

Closes Homebrew/homebrew#42745.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

Fixes Homebrew/homebrew#42461.

Closes Homebrew/homebrew#42743.

Signed-off-by: Xu Cheng <xucheng@me.com>

Closes Homebrew/homebrew#41006.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

Everything that used HOMEBREW_CELLAR/canonical_name
could point to something that doesn't exist because
loader_for tries to load new name formula if no old
name found. However there can be software installed
from path with the same name that renamed formulae
had and we still need to link/unlink/uninstall etc
that software. The solution is Formulary#to_rack
method that returns rack for given name.
- Add Formulary#to_rack
- Update ARGV.kegs
- Update cmd/switch

- TapFormulaWithOldnameAmbiguityError is an exception raised when
multiple tap formulae available for given old name