DpxWriter: bug fix, buffer size of "creator" label
tuttleHost: missing const
tuttleHost pyTest: use a workaround for getPluginCache
tuttleHost pyTest: use a smaller dataset to avoid test timeout
tuttleHost properties: getStringValue with default index to 0
tuttleHost pyTest: check dot export in a new test file
tuttleHost pyTest: test "grouping" property

Move the test from testBrowsePlugins to testPluginInstance
tuttleHost pyTest: peanuts, change formatting