Checking in cleanup to RichText code.  Mainly JSLint fixes + a refactor of the execCommand function so that it's easier to add in custom behaviors for 'builtin' commands if needed.  Tested using DOH Robot tests and manual tests on FF2, FF3.5, Safari 3.2.3, IE 7, IE 8.  IE 6 testing underway.  \!strict fixes #9520
Checking in cleanup to RichText code.  Mainly JSLint fixes + a refactor of the execCommand function so that it's easier to add in custom behaviors for 'builtin' commands if needed.  Tested using DOH Robot tests and manual tests on FF2, FF3.5, Safari 3.2.3, IE 7, IE 8.  IE 6 testing underway.  \!strict fixes #9520

git-svn-id: 674a2d6b1e32e53f607eb824547723f32280967e@19503 560b804f-0ae3-0310-86f3-f6aa0a117693

redaktor/deliteful