fixsubckt
Removes the ** that xschem puts in front of the top level subcircuit. Reads stdin, writes stdout; run by make xsch on every schematic netlist.
Xschem comments out the top .subckt, presumably to emulate a testbench top. This flow wants the opposite: the top cell must be a real subcircuit so it can be instantiated as a DUT inside a testbench.
So **.subckt becomes .subckt, **.ends becomes .ends, and the *+ continuation lines that follow a commented subcircuit line become plain + continuations. Commas are replaced with spaces, which strips the bus notation xschem emits in a port list.