Skidl

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* Updated website.
* KISYSMOD is no longer used to find part libraries, only KICAD_SYMBOL_DIR is used now.

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* Fixed an error where creating a backup part library for a design would create extra pins attached to the nets.

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* Added Network objects to make it easy to create serial & parallel combinations of two-pin parts.
* SKiDL design hierarchy is now embedded in the KiCad netlist that's generated.

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* Added Interface objects for storing complicated sets of I/O signals for subsystems.
* ERC no longer redundantly checks every segment of a multi-segment net and reports multiple errors.
* copy() function of Part, Bus, Pin, Net objects now returns a scalar object while copy(1) returns a list with one object.
* Bus, Pin, and Net objects now have iterators.
* Corrected initialization of KiCad library search paths.

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* Added pull() and fetch() methods for getting/creating existing/new Net and Bus objects.
* Added drive property to pins to override their default pin function attribute.
* Part pins and units can now be accessed as attributes.
* Nets, pins, and buses now support the width property.
* Indexing with brackets now works equivalently for pins, nets, and buses.
* Grouped part pins (such as address and data buses) can now be accessed using a slice-like notation, e.g. memory['ADDR[0:7]'].

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* Matching of pin lists now begins with normal string matching before using regexes.
* Added more tests and fixed existing tests.