prevent unclaimed participants from setting up tips

closes #1967
update the test suite
show a proper error message to the user instead of failing
Merge pull request #2516 from gittip/fix-close-flow

Fix account closing flow
Bump version to 13.2.2
Bump version to 13.2.2-dev
failing test for #1469
clear tips receiving for patrons
ask the user to confirm before clearing tips
another failing test
prevent setting up tips to users who don't accept them
clear existing tips to users who don't accept them
Merge pull request #2517 from gittip/patron-no-tips

Patron no tips
Bump version to 13.2.3
Bump version to 13.2.3-dev
remove applied branch.sql
Merge pull request #2503 from gittip/prevent-tip-from-unclaimed

Prevent unclaimed participants from setting up tips
transfer balance during take_over()
add a branch.sql to deal with existing cases
add test to prevent regression