initial work on showing packrat options immediately after enabling
Merge branch 'master' into feature/packrat-show-options
generate correct code for init/disable/set_opts
merge from master

Merge branch 'master' into feature/packrat-show-options

Conflicts:
	src/gwt/src/org/rstudio/studio/client/projects/ui/prefs/ProjectPackratPreferencesPane.java
	src/gwt/src/org/rstudio/studio/client/projects/ui/prefs/ProjectPreferencesDialog.java
captions tweaks and add todos
update required version
apply list options
factor LabelWithHelp out of spelling prefs
help links for external packages and local repos
Merge pull request #135 from rstudio/feature/packrat-show-options

Feature/packrat show options