Heptagon 1.00.06 (21/02/2014)
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 - allowed abstractions (non-inlined subnodes calls) in contracts

Heptagon 1.00.05 (28/01/2014)
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 - bug fix: correct handling of nodes with contracts inside automata and switches

Heptagon 1.00.04 (14/01/2014)
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 - bug fix: comparison between two non-constant integer expressions in Sigali
 - bug fix: correct handling of "=" and "<>" operators in Sigali

Heptagon 1.00.03 (20/11/2013)
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 - bug fix: tomato application with contracts

Heptagon 1.00.02 (29/10/2013)
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 - scrollbars in graphical simulator hepts

Heptagon 1.00.01 (05/08/2013)
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 - bug fix : abstraction of integer in Sigali code generation
