Rename fields in InstalledPackageInfo for consistency with
PackageDescription & buildInfo:

 extra-libs (extraLibraries) --> extra-libraries (extraLibraries)
 extra-cc-opts (extraCcOpts) --> cc-options (ccOptions)
 extra-ld-opts (extraLdOpts) --> ld-options (ldOptions)
 extra-hugs-opts (extraHugsOpts) --> hugs-options (hugsOptions)
 extra-frameworks (extraFrameworks) --> frameworks (frameworks)