Remove project props to set grails install and corresponding props page
Change 'upgrade' command to take a install to upgrade to.
Fix some tests
Make projectVersionFixer respond to changes in application.properties.
Fix failing test
Remove project install property page and anything related to it.
Remove 'upgrade' functionality from ProjectVersionFixer
Avoid refresh dependencies triggered by application.properties edits unless grails version changed.
Fix some test cases: mock grails project now needs a application.properties file.
Remove 'inheritsDefaultInstall' and anything related to it. 
Obsolote because projects don't inherit default installs but always
use application.properties to determine a compatible install to use.
Fix some NPE and exceptions that aren't real errors.
Remove obsolete test.
Fix test failures.
Fix compilation errors. Some API changes where missed.