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Sébastien Luttringer authored
This introduce the new image format version in X.Y by upgrade from 1 to 2.0.
Where X is an image forward compatibility breaking and Y a revision.

The new format is needed because we move versionning from number to string
5e40d8e2
InstallSystems Next Generation

INSTALLSYSTEMS VERSIONNING
__________________________

A valid version is an integer without dot.
A version n may be followed by a ~ to indicate it's inferior to n
A version n may be followed by a + to indicate it's superior to n
Any following chars after ~ or + are ignored

Examples:
  1 < 2
  2 > 2~dev
  2 < 2+dev
  2~dev < 2+dev


IMAGES VERSIONNING
__________________
A valid version is a string of digits separated by dots.
A version n may be followed by a ~ to indicate it's inferior to n
A version n may be followed by a + to indicate it's superior to n

Examples:
  1.2.3~dev < 1.2.3 < 1.2.3+dev
  7~dev < 7 < 7+dev