Invalid ST code generation

[Thiago Alves]

Beremiz generates invalid ST code when there are two output coils in series. Example:

|-----[ / ]-----[ / ]--------------( S )----( S )--|

[Andrey Skvortsov]

Fix wrong ST code generation in case of several coils connected to each other.

For example, |---|Var0|----(Var1)--(Var2)---|

Closes #32

→ <<cset 068ccc02f5f2>>