BandMathX app: can take expr or cst from txt files. importContext (from otbBandMathImageFilterX) improved

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extra : rebase_source : bc533bd359c28e12ec7be9010e4e41ee4e40b304
BandMathX app: documentation improved
BandMathX: style typo
BandMathX: style typo
STYLE
BUG: At last, we get this damn formula right!
ENH: Adding applications for learning/classification of geometries in a shapefile (written by David Youssefi during his internship at cnes)
STYLE
BandMathx: vmin and vmax operators added (forgot them)

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extra : rebase_source : 9188ea01ba8e59b22f1ce5845152b67b2d52400a
BUG: BandMathX, bad interpretation of HasUserValue method. Suppressed it from the app code.

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extra : rebase_source : bac2db52d3675a8d6dc88133d621b98bc210abfe
ENH: BandMathX, added a useful message when no expression are set. Good for the users, and for the developer of the filter himself
STYLE
ENH: BandMathX, makes filter inherit from itkImageToImageFilter

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extra : rebase_source : e28f7c803e09939691f4e4d995f4eb8d6f1c3491
BUG: BandMathX, forgot important call of UpdateOutputInformation method inside the filter

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extra : rebase_source : 39ec48f4e916927eed2c922e25d369ef569a1736
ENH: remove 6S dependency for VarSol computation
ENH: BandMathX bands operator

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extra : rebase_source : fb865dfd53df61d50a4a7dbf73868d7790970a9b
ENH: BandMathX (example)

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extra : rebase_source : 7bd2e24e276b61ce222ad8793aa3ffeb0c489c75
STYLE