Revert "Let commands decide what mode the installer should use"

I'd still like to make this change, but at least for now the initializer
requires ignore_deps to be set correctly.

This reverts commit 881a8855b944fa9bd7dfd598bb9197f79f7a13f0.

Library/Homebrew/cmd/install.rb

@@ -104,8 +104,6 @@ module Homebrew extend self
 
   def install_formula f
     fi = FormulaInstaller.new(f)
-    fi.ignore_deps = ARGV.ignore_deps? || ARGV.interactive?
-    fi.only_deps = ARGV.only_deps?
     fi.install
     fi.caveats
     fi.finish

Library/Homebrew/cmd/upgrade.rb

@@ -65,8 +65,6 @@ module Homebrew extend self
     installer = FormulaInstaller.new(f)
     installer.options |= tab.used_options
     installer.show_header = false
-    installer.ignore_deps = ARGV.ignore_deps?
-    installer.only_deps = ARGV.only_deps?
 
     oh1 "Upgrading #{f.name}"
 

Library/Homebrew/formula_installer.rb

@@ -22,8 +22,8 @@ class FormulaInstaller
   def initialize ff
     @f = ff
     @show_header = false
-    @ignore_deps = false
-    @only_deps = false
+    @ignore_deps = ARGV.ignore_deps? || ARGV.interactive?
+    @only_deps = ARGV.only_deps?
     @options = Options.new
 
     @@attempted ||= Set.new
@@ -296,6 +296,7 @@ class FormulaInstaller
     fi.options |= dep.options
     fi.options |= inherited_options
     fi.ignore_deps = true
+    fi.only_deps = false
     fi.show_header = false
     oh1 "Installing #{f} dependency: #{Tty.green}#{df}#{Tty.reset}"
     outdated_keg.unlink if outdated_keg