* Some code cleanups to match layout file code guidelines.
* Ported Operator Labels to op file itself.
* Added some Tooltips, theeth: Feel free to change/improve them as you like. :)
Support for fluid files and better support for point cache (including external cache for particles)
This also fixes a couple of bugs with frame based dependencies and with file transfer.
NOTE: With external point cache and fluids, the path needs to be relative or relative to the file (starting with //) if the files are not on a shared drive. It should eventually warn if that is not the case, but doesn't right now, so be careful.