Fix wrong ST code generation in case of several coils connected to each other.
For example,
|---|Var0|----(Var1)--(Var2)---|
Closes #32
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PROJECT_NAME;%(Project Name)s;;;;;;;;;;;;;;
VERSION_OF_REFERENCEFILE;%(EDE file version)d;;;;;;;;;;;;;;
TIMESTAMP_OF_LAST_CHANGE;%(Current Time)s;;;;;;;;;;;;;;
AUTHOR_OF_LAST_CHANGE;%(Project Author)s;;;;;;;;;;;;;;
VERSION_OF_LAYOUT;2.1;;;;;;;;;;;;;;
#mandatory;mandatory;mandatory;mandatory;mandatory;optional;optional;optional;optional;optional;optional;optional;optional;optional;optional;optional
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