uEye camera: added pixel clock related functions.
uEye camera: added and implemented the 'getDefaultPixelClock' method.
Camera class: Added the 'displayInfo' method.

This method displays informations about the camera on the standard
output.
main: Added the -i command-line argument.

This option displays informations about the connected cameras.
NOTE: this is currently really messy and shall be fixed in ulterior
releases.
uEye: Added minimum, maximum and step getters for the pixel clock.

These methods are helper functions that rely on the
'getPixelClockRange' method.
uEye camera: the pixel clock is now set to its minimum value.
Merge branch 'ueye_pixel_clock'