Revert "Made all mainactivity fragments inherit from ListFragment, and made it all compile"

This reverts commit 193b0abea1508c6f62320ca5efc9084976316cf0.
Revert "using PullAndLoadListView"

This reverts commit c4cb6942a33391b52734f9b0e0b9763fb0f980c4.
Revert "Using the ptr list views"

This reverts commit 6ebe6ea395e275ea237817194e7528ee0cbd9621.