Added Tooltips and a Help Dictionary for the User Options.

Updated readme to point to a specific version of wxpython for lion

Updated readme...there have been a lot of issues with pronterface on Lion. The link I added should clarify some of the confusion.

Use a single variable for build size, allow setting bed center coordinates.

Reduced the amount of data emitted to the user after loading a file.

The extra data while interesting, belongs in a deliberate command to show stats.
summary line reads:
  Estimated duration (pessimistic):  187 layers, 00:29:42

Make STLs less shiny on non-Linux OSs

Merge fixes added to master into experimental

Complete rewrite of time estimation with acceleration

Fixed documentation regarding wxPython on MacOS Lion

changed instruction for MacOs Lion to download stable wxPython because unstable version breaks the axis control panel

Bugfix: paths were not hilighted in preview during print anymore

Faster firmware startup for sanguinololu and similar boards

Made SD Upload call the right function - not the SD Print function

Fix manually input port names

port setting is now also respected if the port exists but is not detected in scan (for udev symlinks)

  Accounts for G4 Pxxx
  Accounts for Z moves as well.
  Also prints out duration for each layer while calculating the total time.

  Does not use individual axis acceleration, only uses sprinter default acceleration 1500.0 mm/s/s
  Does not count E for timing... so if E is slowing down the move, we're not accounting for that.

** fixed: 2x distance to reach full speed, because accel and decel to 0.0 at each move.

TODO:
  Get Device Caps (per axis acceleration, per axis speed limits)
  anything else...?