Added final semicolon after final OBJ in the file filter

Proposed changes in the MacosX pre lion installation instructions

Second try - Proposed changes in the MacosX pre lion installation instructions as per irc conversation.

improve french translation.

Cleaned up commit from l4nce0

    Now when the program starts the last temp is set for Heater and Bed. Also a (user) is attached if it is a manual entry.

last used serial port pre-selection logic change, based on if it is autodetected to be present or not

Closes #41
Closes #51

Paint travel moves with a different colour

French translation fix

Fix inverted Y coordinates in normals

Only adds the STL filename to the listbox, not the whole path.